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Squares and Square Roots Class 8 Questions And Answers provided here. These NCERT Solutions are created by expert team at craeers360 keeping the latest syllabus and pattern of CBSE 2023-23. The NCERT solutions for Class 8 Maths chapter 6 Squares and Square Roots cover questions related to squares of numbers and square roots of numbers. It contains explanation to 4 exercises with 30 questions. Practicing questions is important to score good marks in Mathematics.
Square means a number will be multiplied 2-times by itself. For example:- If we want to calculate the square of 6, then the square will be 6×6 = 36, likewise square of 5 = 5×5 = 25. The square root is just a reverse application of square, it means when a number multiplied 2-times by itself then it will result in the square and the root number of this result is called the square root. For example- the square of 3 = 3 × 3 which is equal to 9 and similarly in the reverse manner square root of 9 is equal to 3. Here you will get the detailed NCERT Solutions for Class 8 by clicking on the link.
Square Root Formula: If q is a natural number such that p2 = q, then √q = p and -p.
Properties of Squares and Square Roots:
There are 2n non-perfect square numbers between n2 and (n+1)2.
If a perfect square has n digits, its square root will have n/2 digits if n is even, or (n+1)/2 digits if n is odd.
Free download NCERT Solutions for Class 8 Maths Chapter 6 Squares and Square Roots for CBSE Exam.
Squares and square roots class 8 NCERT Solutions - Topic 6.1
Q.1 Find the perfect square numbers between
(i) and
(ii) and
Answer:
(i) We know that
So clearly 36 is the perfect square number between 30 and 40.
(ii) We know
So clearly it can be seen that there does not exist any perfect square number between 50 and 60
NCERT Solutions for Class 8 Maths Chapter 6 Squares and Square Roots - Topic 6.2
Q.1 Can we say whether the following numbers are perfect squares? How do we know?
Answer:
We know that numbers which end with 0, 1, 4, 5, 6 or 9 at units place may be a perfect square number and all other number are not perfect square number.
Since the given number has 7 at units place hence this number is not a perfect square.
Q.1(ii) Can we say whether the following numbers are perfect squares? How do we know?
Answer:
We have 23453.
Since this number ends with digit 3 so it cannot be a perfect square. (As we know a number must end with 0, 1, 4, 5, 6 or 9 for being a perfect square number.)
Q.1(iii) Can we say whether the following numbers are perfect squares? How do we know?
Answer:
It is known that a number must end with 0, 1, 4, 5, 6 or 9 at units place for being a perfect square.
The given number ends with 8 so it is not a perfect square.
Q.1 (iv) Can we say whether the following numbers are perfect squares? How do we know?
Answer:
Given number ends with digit 2.
We know that only a number ending with 0, 1, 4, 5, 6 or 9 at units place can be perfect square.
Therefore 222222 is not a perfect square number.
Q.1(v) Can we say whether the following numbers are perfect squares? How do we know?
Answer:
Since the units place of a given number is 9, thus it may or may not be a perfect square number.
As we know a number ending with 0, 1, 4, 5, 6 or 9 at units place can be a perfect square number.
Q.1 (vi) Can we say whether the following numbers are perfect squares? How do we know?
Answer:
It is known that the numbers that end with 0, 1, 4, 5, 6 or 9 at units place may be a perfect square.
Given number has 1 as the last digit so it may be a perfect square number.
Answer:
The five numbers can be :- 521, 655, 124, 729, 1940 etc.
Basically, numbers ending with 0, 1, 4, 5, 6 or 9 at units place can be square numbers.
Q. Which of would end with digit ?
Answer:
It is known that if a number has 1 or 9 in the units place, then it’s square ends in 1.
So squares of 161 and 109 would end with digit 1.
Q. Which of the following numbers would have digit 6 at unit place.
(i)
(ii)
(iii)
(iv)
(v)
Answer:
We know that when a square number ends in 6, the number whose square will have either 4 or 6 in unit’s place.
So the required numbers are squares of 24, 26, 36, 34.
Q (i). What will be the “one’s digit” in the square of the following numbers?
1234
Answer:
We have 1234.
Therefore one's digit is 6. (Since Square of digits ending with 4 gives 6 at units place.)
Q (ii) . What will be the ones digit in the square of the following numbers
26387
Answer:
We have 28367.
So the one's digit will be 9. (Since Square of digits ending with 7 gives 9 at units place.)
Q (iii). What will be the “one’s digit” in the square of the following numbers?
Answer:
We have 52698.
Its square will end with 4. (Since square of a number ending with 8 ends with 4 at units place.)
Q (iv). What will be the “one’s digit” in the square of the following numbers?
Answer:
We have 99880.
0 will be the “one’s digit” in the square of this number. (Since the square of a number which ends with 0 will have 0 at units place.)
Q (v). What will be the “one’s digit” in the square of the following numbers?
Answer:
4 will be the “one’s digit” in the square of the 21222.
Since the square of a number ending with 2 will give 4 at units place.
Q (vi) . What will be the “one’s digit” in the square of the following numbers?
Answer:
6 will be the “one’s digit” in the square of 9106.
As we know that we get 6 at units place when we square a number ending with 6.
Q1. The square of which of the following numbers would be an odd number/an even number? Why?
(i) 727
(ii) 158
(iii) 269
(iv) 1980
Answer:
We know that the squares of even numbers are even numbers and squares of odd numbers are odd numbers.
So squares of 727 and 269 will be odd numbers, and squares of 158 and 1980 will be even numbers.
Q2. What will be the number of zeros in the square of the following numbers?
(i) 60
(ii) 400
Answer:
Square of a number having x number of zeros will have 2x number of zeros.
Thus, (i) 60: Number of zeros will be 2.
(ii) 400: Number of zeros will be 4.
NCERT Solutions for Class 8 Maths Chapter 6 Squares and Square Roots - Topic 6.3
Q.1 How many natural numbers lie between and ? Between and ?
Answer:
In general, we can say that there are 2n non-perfect square numbers between the squares of the numbers n and (n + 1).
Thus between squares of 9 and 10, the number of natural numbers is 2(9) = 18
Similarly, between squares of 11 and 12, the number of natural numbers is 2(11) = 22
Q.2 How many non square numbers lie between the following pairs of numbers
(i)
(ii)
(iii)
Answer:
In general, we can say that there are 2n nonperfect square numbers between the squares of the numbers n and (n + 1).
(i) The number of non-square numbers that lie between the square of 100 and 101 will be = 2(100) = 200.
(ii) The number of non-square numbers that lie between the square of 90 and 91 will be = 2(90) = 180.
(iii) The number of non-square numbers that lie between the square of 1000 and 1001 will be = 2(1000) = 2000.
Q(i). Find whether each of the following numbers is a perfect square or not?
121
Answer:
If it is a sum of successive odd natural numbers starting with 1, then it is a perfect square.
So we try to express 121 in successive integers. This can also be done by subtracting successive odd natural numbers from 121.
Applying the concept :-
121 - 1 = 120
120 - 3 = 117
117 - 5 = 112
112 - 7 = 105
105 - 9 = 96
96 - 11 = 85
85 - 13 = 72
72 - 15 = 57
57 - 17 = 40
40 - 19 = 21
21 - 21 = 0
Thus 121 is a perfect square.
Q(ii). Find whether each of the following numbers is a perfect square or not?
55
Answer:
If it is a sum of successive odd natural numbers starting with 1, then it is a perfect square.
So we try to express 55 in successive integers. This can also be done by subtracting successive odd natural numbers from 55.
55 - 1 = 54 ; 54 - 3 = 51 ; 51 - 5 = 46 ; 46 - 7 = 39 ; 39 - 9 = 30 ; 30 - 11 = 19 ; 19 - 13 = 6.
Thus 55 is not a perfect square.
Q(iii). Find whether each of the following numbers is a perfect square or not?
81
Answer:
If it is a sum of successive odd natural numbers starting with 1, then it is a perfect square.
So we try to express 81 in successive odd natural numbers. This can also be done by subtracting successive odd natural numbers from 81.
81 - 1 = 80
80 - 3 = 77
77 - 5 = 72
72 - 7 = 65
65 - 9 = 56
56 - 11 = 45
45 - 13 = 32
32 - 15 = 17
17 - 17 = 0
Thus 81 is a perfect square number.
Q(iv). Find whether each of the following numbers is a perfect square or not?
49
Answer:
If it is a sum of successive odd natural numbers starting with 1, then it is a perfect square.
So we try to express 49 in successive odd natural numbers. This can also be done by subtracting successive odd natural numbers from 49.
49 - 1 = 48
48 - 3 = 45
45 - 5 = 40
40 - 7 = 33
33 - 9 = 24
24 - 11 = 13
13 - 13 = 0.
Hence 49 is a perfect square number.
Q (v). Find whether each of the following numbers is a perfect square or not?
69
Answer:
If it is a sum of successive odd natural numbers starting with 1, then it is a perfect square.
So we try to express 69 in successive odd natural numbers. This can also be done by subtracting successive odd natural numbers from 69.
69 - 1 = 68
68 - 3 = 65
65 - 5 = 60
60 - 7 = 53
53 - 9 = 43
43 - 11 = 32
32 - 13 = 19
19 - 15 = 4
So the given number 69 is not a perfect square.
Q.1 Express the following as the sum of two consecutive integers.
(i)
(ii)
(iii)
(iv)
Answer:
(i) 21 2 = 441 => 220 + 221
(ii) 13 2 = 169 => 84 + 85
(iii) 11 2 = 121 => 60 + 61
(iv) 19 2 = 361 => 180 + 181
Answer:
No, the reverse is not true.
For e.g, the two consecutive number 20 and 21 gives a sum of 41. But we know that 41 is not a perfect square.
Class 8 maths ch 6 question answer - Topic 6.4
Q (i) . Find the squares of the following numbers containing 5 in unit’s place.
15
Answer:
Assume a number with unit digit 5 = a5
= = 10a(10a + 5) + 5(10a + 5) = 100a 2 + 50a + 50a + 25
= 100a(a + 1) + 25
= a(a + 1) hundred + 25
We will use this result here,
We have a5 = 15 , So a = 1
= 1(1+1)100 + 25 = 200 + 25 = 225
Q (ii). Find the squares of the following numbers containing 5 in unit’s place.
95
Answer:
Assume a number with unit digit 5 = a5
= = 10a(10a + 5) + 5(10a + 5) = 100a 2 + 50a + 50a + 25
= 100a(a + 1) + 25
= a(a + 1) hundred + 25
We are going to use this result here.
In this question a = 9
so, = 9(9+1)hundred + 25
= 9000 + 25 = 9025
Q (iii) . Find the squares of the following numbers containing 5 in unit’s place.
105
Answer:
Assume a number with unit digit 5 = a5
= = 10a(10a + 5) + 5(10a + 5) = 100a 2 + 50a + 50a + 25
= 100a(a + 1) + 25
= a(a + 1) hundred + 25.
We will use this concept here.
a = 10; so = 10(10+1)hundred + 25
= 10(11)hundred + 25
= 11000 + 25 = 11025
Q (iv). Find the squares of the following numbers containing 5 in unit’s place.
205
Answer:
Consider a number with unit digit 5, i.e., a5
= = 10a(10a + 5) + 5(10a + 5) = 100a 2 + 50a + 50a + 25
= 100a(a + 1) + 25
= a(a + 1) hundred + 25.
Here a = 20
Hence = 20(20+1)hundred + 25
= 20(21)hundred + 25 = 42000 + 25
= 42025
NCERT Solutions for Class 8 Maths Chapter 6 Squares and Square Roots - Topic 6.5.1
Answer:
The detailed solution for the above-mentioned question is written here
Yes, Because after squaring -1 & 1 we get 1 in both the cases.
Since
Answer:
The solution for the above-written question is written here
Yes, because
is a square root of
Answer:
The solution for the above-written question is as follow
Yes, because
NCERT Solutions for Class 8 Maths Chapter 6 Squares and Square Roots - Topic 6.5.2
(i) 121
Answer:
Consider . Then
81 - 1 = 80
80 - 3 = 77
77 - 5 = 72
72 - 7 = 65
65 - 9 = 56
56 - 11 = 45
45 - 13 = 32
32 - 15 = 17
17 - 17 = 0.
Since zero is obtained in the 9th step thus = 9.
(ii) 55
Answer:
We have . Then
55 - 1 = 54
54 - 3 = 51
51 - 5 = 46
46 - 7 = 39
39 - 9 = 30
30 - 11 = 19
19 - 13 = 6.
Thus the given number is not a perfect square.
(iii) 36
Answer:
We have . Then
36 - 1 = 35
35 - 3 = 32
32 - 5 = 27
27 - 7 = 20
20 - 9 = 11
11 - 11 = 0 .
We get zero on the 6th step so
(iv) 49
Answer:
We have . Then
49 - 1 = 48
48 - 3 = 45
45 - 5 = 40
40 - 7 = 33
33 - 9 = 24
24 - 11 = 13
13 - 13 = 0 .
We get zero on the 7th step so
(v) 90
Answer:
We have , then
90 - 1 = 89
89 - 3 = 86
86 - 5 = 81
81 - 7 = 74
74 - 9 = 65
65 - 11 = 54
54 - 13 = 41
41 - 15 = 26 ;
26 - 17 = 9.
So from the all above calculation, we can say that the given number is not a perfect square.
NCERT Solutions for Class 8 Maths Chapter 6 Squares and Square Roots - Topic 6.5.4
Answer:
Solution for the above-written question is as follows,
Yes.
The smallest 3-digit perfect square number = 100
which is the square of 10
the greatest 3-digit perfect square number is 961
which is the square of 31.
The smallest 4-digit square number is 1024
which is the square of 32
The greatest 4-digit number is 9801
which is the square of 99.
Answer:
The solution for the above-written question is as follows,
Since the given number has 5 digits. So the number of digits in square root :
Q (ii). Without calculating square roots, find the number of digits in the square root of the following numb er.
100000000
Answer:
The solution for the above-written question is as follows
Since the given number has a total of 9 digits.
Therefore the number of digits in the square root will be :
36864
Answer:
The solution for the above-written question is as follows
The given number has a total of 5 digits.
Thus the number of digits in the square root of this number
NCERT Solutions for maths chapter 6 class 8 Squares and Square Root - Topic 6.7
Q (i) . Estimate the value of the following to the nearest whole number.
Answer:
A detailed explanation of the above-written question is as follows
We know that and
So the whole number closest to is 9.
Q (ii). Estimate the value of the following to the nearest whole number.
Answer:
The detailed explanation of the above-written question is as follows
We know that and .
So the whole number closest to is 32.
Q (iii). Estimate the value of the following to the nearest whole number.
Answer:
The detailed explanation for the above-written question,
We have .
It is known that: and
So the closest whole number to is 19.
Q. Estimate the value of the following to the nearest whole number.
(iv)
Answer:
The detailed explanation for the above-written question is as follows
We have .
We know: and
So the closest whole number to is 22.
NCERT Solutions for Class 8 Maths Chapter 6 Squares and Square Roots Exercise 6.1
Q.1 What will be the unit digit of the squares of the following numbers?
(i) 81
(ii) 272
(iii) 799
(iv) 3853
(v) 1234
(vi) 26387
(vii) 52698
(viii) 99880
(ix) 12796
(x) 55555
Answer:
The unit digit of the squares of the following numbers will be :-
(i) 81 :- 1
(ii) 272 :- 4
(iii) 799 :- 1
(iv) 3853 :- 9
(v) 1234 :- 6
(vi) 26387 :- 9
(vii) 52698 :- 4
(viii) 99880 :- 0
(ix) 12796 :- 6
(x) 55555 :- 5
2. The following numbers are obviously not perfect squares. Give reason.
(i) 1057
(ii) 23453
(iii) 7928
(iv) 222222
(v) 64000
(vi) 89722
(vii) 222000
(viii) 505050
Answer:
We know that only the numbers that end with 0, 1, 4, 5, 6 or 9 at units place can be perfectly square numbers.
Also, a perfectly square number has a number of zeros in multiple of 2.
Since these numbers have either odd no. of zeros or their unit place is 2, 3, 7, 8 thus they are not perfectly square numbers.
Q.3 The squares of which of the following would be odd numbers?
(i) 431
(ii) 2826
(iii) 7779
(iv) 82004
Answer:
It is known that square of an odd number is always an odd number.
Therefore the square of 431 and 7779 will also be an odd number.
Q.4 Observe the following pattern and find the missing digits.
Answer:
By observation, it is clear that the no. of zeros between 1 and 1 in LHS are equal to the no. of zeros between 1-2 and 2-1 in the RHS.
So,
and
Q.5 Observe the following pattern and supply the missing numbers.
Answer:
The solution for the above-written question is as follows
By observation we get,
and
Q.6 Using the given pattern, find the missing numbers.
Answer:
Patter is clearly visible.
First two numbers and the last two numbers are the consecutive numbers.
Moreover, the third number is obtained when the first is multiplied with the second number.
So required numbers can be found.
i.e., 4 5 = 20 and 6 7 = 42
hence
and
and
Q.7 Without adding, find the sum.
(i)
(ii)
(iii)
Answer:
It is known that sum of odd cosecutive number starting from 1 is .
(i) n = 5 i.e.,
(ii) n = 10 i.e.,
(iii) n = 12 i.e.,
8 (i) Express as the sum of odd numbers.
Answer:
The solution for the above mentioned question is as follows:-
The splitted form of 49 (In increasing odd numbers) :- 1 + 3 + 5 + 7 + 9 + 11 + 13
8 (ii) Express 121 as the sum of 11 odd numbers.
Answer:
The splitted form of number 121 (starting with odd numbers in increasing orders) = 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21
Q. 9 (i) How many numbers lie between squares of the following numbers?
Answer:
We know that there are 2n non-perfect square numbers between the squares of the numbers n and (n + 1).
So for this question, n = 12
So total numbers that lie between squares of 12 and 13 are = 2(12) = 24.
Q9 (ii) . How many numbers lie between squares of the following numbers?
Answer:
It is known that there are 2n non-perfect square numbers between the squares of the numbers n and (n + 1).
So total number that lie between 25 and 26 will be = 2(25) = 50
Q.9 (iii) How many numbers lie between squares of the following numbers?
Answer:
We know that there are 2n non-perfect square numbers between the squares of the numbers n and (n + 1).
In this question, we have n = 99
Thus total number that lie between 99 and 100 = 2(99) = 198
Class 8 squares and square roots ncert solutions - exercise 6.2
Q.1 Find the square of the following numbers.
(i) 32
(ii) 35
(iii) 86
(iv) 93
(v) 71
(vi) 46
Answer:
(i) = = 30(30 + 2) + 2(30 + 2) = 30(32) + 2(32) = 960 + 64 = 1024
(ii) = = 30(30 + 5) + 5(30 + 5) = 30(35) + 5(35) = 1050 + 175 = 1225
(iii) = = 80(80 + 6) + 6(80 + 6) = 80(86) + 6(86) = 6880 + 516 = 7396
(iv) = = 90(90 + 3) + 3(90 +3) = 90(93) + 3(93) = 8370 + 279 = 8649
(v) = = 70(70 + 1) + 1(70 + 1) = 70(71) + 1(71) = 4970 + 71 = 5041
(vi) = = 40(40 + 6) + 6(40 + 6) = 40(46) + 6(46) = 1840 + 276 = 2110
Q.2(i). Write a Pythagorean triplet whose one member is.
6
Answer:
For any natural number m > 1, 2m, and forms a Pythagorean triplet.
So if we take,
But value of m will not be an integer.
Now we take,
but the value of m will not be an integer.
If we take 2m = 6
then m = 3
Then 9 - 1 = 8 and 9 + 1 = 10.
Therefore the required triplet is 6, 8 and 10
Q.2 (ii) Write a Pythagorean triplet whose one member is.
14
Answer:
For any natural number m > 1, 2m, and forms a Pythagorean triplet.
So if we take,
But then the value of m will not be an integer.
We take,
but the value of m will not be an integer.
If we take 2m = 14
or m = 7
Then 49 - 1 = 48 and 49 + 1 = 50.
Therefore the combination of number is 14, 48 and 50.
Q.2 (iii) Write a Pythagorean triplet whose one member is.
16
Answer:
For any natural number m > 1, 2m, and forms a Pythagorean triplet.
So if we take,
But the value of m will not be an integer.
Now we take,
but the value of m will not be an integer.
If we take 2m = 16
then m = 8
Then 64 - 1 = 63 and 64 + 1 = 65.
Therefore the required numbers are 16, 63 and 65.
Q.2 (iv) Write a Pythagorean triplet whose one member is.
18
Answer:
For any natural number m > 1, 2m, and forms a Pythagorean triplet.
So if we take,
But the value of m will not be an integer.
Now we take,
but the value of m will not be an integer.
If we take 2m = 18
then m = 9
Then 81 - 1 = 80 and 81 + 1 = 82.
Therefore the required combination is 18, 80 and 82
Class 8 maths chapter 6 ncert solutions - exercise 6.3
1 (i). What could be the possible ‘one’s’ digits of the square root of each of the following numbers?
9801
Answer:
We know that square of digits ending with 1 and 9 gives 1 at units place.
So the number whose square ends in 1 = 1 & 9
So, possible unit digit of the square root of 9801 = 1 and 9.
1 (ii). What could be the possible ‘one’s’ digits of the square root of each of the following numbers?
99856
Answer:
We know that square of digits ending with 4 and 6 gives 6 at its units place.
So possible ‘ones’ digits of the square root of 99856 are 4 and 6.
Q1 (iii). What could be the possible ‘one’s’ digits of the square root of each of the following numbers?
998001
Answer:
We know that square of digits ending with 1 and 9 gives 1 at units place.
So the possible ‘one’s’ digits of the square root of 998001 are 1 and 9.
Q1 (iv). What could be the possible ‘one’s’ digits of the square root of each of the following numbers?
657666025
Answer:
We know that square of a number ending with 5 gives 5 at its units place.
So the possible ‘one’s’ digits of the square root of 657666025 are 5.
Q.2 Without doing any calculation, find the numbers which are surely not perfect squares.
(i) 153
(ii) 257
(iii) 408
(iv) 441
Answer:
As we know the units place of a perfect square cannot be 2, 3, 7, and 8.
So 153, 257, 408 are surely not perfect squares.
Q.3 Find the square roots of and by the method of repeated subtraction.
Answer:
(i) For 100 :- 100 - 1 = 99
99 - 3 = 96
96 - 5 = 91
91 - 7 = 84
84 - 9 = 75
75 - 11 = 64
64 - 13 = 51
51 - 15 = 36
36 - 17 = 19
19 - 19 = 0.
We obtain zero at 10th step so
(ii) For 169 :- 169 - 1 = 168
168 - 3 = 165
165 - 5 = 160
160 - 7 = 153
153 - 9 = 144
144 - 11 = 133
133 - 13 = 120
120 - 15 = 105
105 - 17 = 88
88 - 19 = 69
69 - 21 = 48
48 - 23 = 25;
25 - 25 = 0.
We obtain Zero at the 13th step so
Q.4 (i) Find the square roots of the following numbers by the Prime Factorisation Method.
(i) 729
Answer:
By prime factorisation, we know that
or
Thus the square root of 729 is 27.
Q.4 (ii) Find the square roots of the following numbers by the Prime Factorisation Method.
400
Answer:
By prime factorization, we get
or
Thus the square root of 400 is 20
Q4 (iii). Find the square roots of the following numbers by the Prime Factorisation Method.
1764
Answer:
We have 1764, by prime factorization we get
or
Thus the square root of 1764 is 42.
Q.4 (iv) Find the square roots of the following numbers by the Prime Factorisation Method.
4096
Answer:
We have 4096, by prime factorization:
or .
So the square root of 4096 is 64.
Q.4 (v) Find the square roots of the following numbers by the Prime Factorisation Method.
(v) 7744
Answer:
We have in 7744. By prime factorization, we get
or
Thus the square root of 7744 is 44.
Q.4 (vi) Find the square roots of the following numbers by the Prime Factorisation Method.
(vi) 9604
Answer:
We have in 9604. By prime factorization we get,
or
Hence the square root of 9604 is 98.
Q.4 (vii) Find the square roots of the following numbers by the Prime Factorisation Method.
5929
Answer:
The solution for the above-written question is as follows
Prime factorization of number 5929,
or .
Thus, the square root of 5929 is 77.
Q4 (viii). Find the square roots of the following numbers by the Prime Factorisation Method.
(viii) 9216
Answer:
The solution for the above-written question is as follows
prime factorization of 9216,
or .
Thus, the square root of 9216 is 96.
Q.4 Find the square roots of the following numbers by the Prime Factorisation Method.
(ix) 529
Answer:
The solution for the above-written question is as follows
We have 529.
Prime factorization gives
So square root of 529 is 23.
Q.4 Find the square roots of the following numbers by the Prime Factorisation Method.
(x) 8100
Answer:
The solution for the above-written question is as follows
We have in 8100.
By prime factorization, we get :
or .
So square root of 8100 is 90.
(i) 252
(ii) 180
(iii) 1008
(iv) 2028
(v) 1458
(vi) 768
Answer:
(i) 252 : Prime factorisation of 252 = .
To make pairs we will multiply 252 with 7.
So the number is 1764 and its square root is 42.
(ii) 180 : Prime factorisation of 180 = .
To make it perfect square, multiply by 5.
So the number is 900 and its square root is 30.
(iii) 1008 : Prime factorization of 1008 gives = .
To make pairs we need to multiply it by 7.
So the number we get is 7056 and its square root is 84.
(iv) 2028 : Prime factorisation of 2028 = .
To make pairs we multiply the number by 3.
So the number obtained is 6084 and its square root is 78.
(v) 1458 : Prime factorisation of 1458 gives =
To make pairs we need to multiply the number by 2.
So the number obtained is 2916 and its square root is 54.
(vi) 768 : Prime factorisation of 768 gives =
To make pairs we need to multiply the given number by 6.
So the required number is 4608 and its square root is 48.
(i) 252
(ii) 2925
(iii) 396
(iv) 2645
(v) 2800
(vi) 1620
Answer:
(i) 252: Prime factorization of 252 gives = .
For making pairs we will divide the given number by 7.
The obtained number is 36 and its square root is 6.
(ii) 2925: Prime factorization of 2925 gives =
To make pairs divide the given number by 13.
So the obtained number is 225 and its square root is 15.
(iii) 396: Prime factorization if 396 =
For obtaining perfect square number we need to divide the given number by 11.
So the required number is 36 and its square root is 6.
(iv) 2645: Prime factorization of 2645 =
We need to divide the given number by 5 to obtain the perfect square number.
So the obtained number is 529 and its square root is 23.
(v) 2800: Prime factorization of 2800 =
To make pairs we need to divide 2800 by 7.
So the required number is 400 and its square root is 20.
(vi) 1620: Prime factorization of 1620 gives =
To make pairs divide the given number by 5.
We get , number = 324 and its square root = 18.
Answer:
Let the number of students in a class be x.
According to question,
Number of student = money donated by each of the students
So total money donated =
or
Prime factorization of
So the number of students in the class = 49.
Answer:
The total number of plants = No. of rows No. of plants in 1 row.
Since in this case no.of rows = no. of plants in each row.
Thus let us assume the number of rows to be x.
Then the equation becomes :
Prime factorization of 2025 gives =
So value of x is = 45.
Hence no. of rows = 45; and no. of plants in each row = 45.
Q. 9 Find the smallest square number that is divisible by each of the numbers and .
Answer:
This has to be done in two steps. First, we will find LCM of given numbers, then we will make it a perfect square.
So the LCM of 4, 9, 10 is 180. 4 = 2 2 ; 9 = 3 3 ; 10 = 2 5
Prime factorisation of 180 gives = .
To make it a perfect square we need to multiply it with 5.
So, the smallest square number which is divisible by each of the numbers 4, 9 and 10 = 900.
Q.10 Find the smallest square number that is divisible by each of the numbers and .
Answer:
This has to be done in two steps. First we will find LCM of given numbers, then we will make it perfect square.
So the LCM of 8, 15, 20 is 120 . 8 = 2 2 2 ; 15 = 3 5 ; 20 = 2 2 5
Prime factorisation of 120 gives = .
To make it a perfect square we need to multiply it with 30.
So the smallest square number that is divisible by each of the numbers 4, 9 and 10 is 3600.
Class 8 maths chapter 6 question answer - exercise 6.4
Q.1 (i) Find the square root of each of the following numbers by Division method.
2304
Answer:
The detailed explanation for the above-written question is as follows,
We will find the square root using the division method.
Squares and Square Roots Excercise: 6.4
Question:
Q.1 (ii) Find the square root of each of the following numbers by Division method.
4489
Answer:
The square root of 4489 is 67.
Q.1 (iii ) Find the square root of each of the following numbers by Division method.
3481
Answer:
The square root of 3481 is obtained as 59.
Q1 (iv). Find the square root of each of the following numbers by Division method.
529
Answer:
The detailed solution for the above-written question is as follows
The square root of 529 is 23.
Q1 (v). Find the square root of each of the following numbers by Division method.
3249
Answer:
The detailed solution for the above-written question is as follows,
The square root of 3249 is 57.
Q1 (vi). Find the square root of each of the following numbers by Division method.
1369
Answer:
The detailed solution for the above-written question is as follows,
The square root of 1369 is 37.
Q1 (vii). Find the square root of each of the following numbers by Division method.
5776
Answer:
The solution for the above-written question is as follows,
The square root of 5776 is 76.
Q1 (viii). Find the square root of each of the following numbers by Division method.
7921
Answer:
The detailed solution for the above-written question is as follows,
The square root of 7921 is 89.
Q1 (ix). Find the square root of each of the following numbers by Division method.
576
Answer:
The detailed solution for the above-written question is as follows,
The square root of 576 is 24.
Q1 (x). Find the square root of each of the following numbers by Division method.
1024
Answer:
The detailed solution for the above-written question is as follows,
The square root of 1024 is 32.
Q.1(xi) Find the square root of each of the following numbers by Division method.
3136
Answer:
The detailed solution for the above-written question is as follows,
The square root of 3136 is 56.
Q.1 (xii) Find the square root of each of the following numbers by Division method.
900
Answer:
The detailed solution for the above-written question is as follows
The square root of 900 is 30.
(i) 64
(ii) 144
(iii) 4489
(iv) 27225
(v) 390625
Answer:
(i) 64:- The number of digits in the square root will be
(ii) 144:- The number of digits in the square root will be
(iii) 4489:- The number of digits in the square root will be
(iv) 27225:- The number of digits in the square root will be
(v) 390625:- The number of digits in the square root will be
Q.3. Find the square root of the following decimal numbers.
(i)
(ii)
(iii)
(iv)
(v)
Answer:
The detailed solution for the given questions as follows
(i) Square root of 2.56 using division method
(ii) The square root of 7.29 using division method
(iii) The square root of 51.84 using division method
(iv) The square root of 42.25 using division method
(v) The square root of 31.36 using division method
(i) 402
(ii) 1989
(iii) 3250
(iv) 825
(v) 4000
Answer:
(i) 402 :- It can be seen that 2 is remainder. So we will subtract 2 from 402.
The required number is 400 and its square root is 20.
(ii) 1989:- It can be seen that 53 is remainder here. So we will subtract 53 from 1989 in order to make it a perfect square.
The required number is 1936 and its square root is 44.
(iii) 3250 :- It can be seen that 1 is remainder. So we will subtract 1 from 3250.
The required number is 3249 and its square root is 57.
(iv) 825:- It can be seen that 41 is remainder. So we will subtract 41 from 825 to make it a perfect square number.
The required number is 784 and its square root is 28.
(v) 4000 :- It can be seen that 31 is remainder here. So we will subtract 31 from 4000.
The required number is 3969 and its square root is 63.
(i) 525
(ii) 1750
(iii) 252
(iv) 1825
(v) 6412
Answer:
(i) 525:- It is clearly visible that if we add 4 to the given number, the remainder will become zero.
So obtained number is 529 and its square root is 23.
(ii) 1750:- It is clearly visible that if we add 14 to the given number, the remainder will become zero.
So the obtained number is 1764 and its square root is 42.
(iii) 252:- It is clearly visible that if we add 4 to the given number, the remainder will become zero.
So the obtained number is 256 and its square root is 16.
(iv) 1825:- It is clearly visible that if we add 24 to the given number, the remainder will become zero.
So the obtained number is 1849 and its square root is 43.
(v) 6412:- It is clearly visible that if we add 149 to the given number, the remainder will become zero.
So the obtained number is 6561 and its square root is 81.
Q.6 Find the length of the side of a square whose area is .
Answer:
Let the length of the side of a square be x m.
Area of square =
So equation becomes :
By prime factorisation of 441.
441 =
Thus x = 21.
So the length of the side of square = 21 m.
7 (a). In a right triangle
(a) If , , find
Answer:
Using Pythagoras theorem,
By prime factorisation of 100 :-
We get, AC = 10cm
Q.7 (b) In a right triangle
If find
Answer:
Using Pythagoras theorem,
or
or
or
Prime factorisation of 144 gives :-
Hence, AB = 12 cm
Answer:
It is given that the number of rows and the number of columns are the same.
Let a number of rows or number of columns be x.
The number of plants required =
The gardener has 1000 plants.
We need to find a perfect square just greater than 1000.
We know, and
So the minimum plants needed by gardener = 1024 - 1000 = 24 plants.
Answer:
Given that the number of rows is equal to the number of columns. i.e., in the form of
So the number of students that can stand in this order will be the perfect square number just less than 500.
We know that and
So the number of students that would be left out in this arrangement = 500 - 484 = 16 students.
Chapter -1 | Rational Numbers |
Chapter -2 | Linear Equations in One Variable |
Chapter-3 | Understanding Quadrilaterals |
Chapter-4 | Practical Geometry |
Chapter-5 | Data Handling |
Chapter-6 | Squares and Square Roots |
Chapter-7 | Cubes and Cube Roots |
Chapter-8 | Comparing Quantities |
Chapter-9 | Algebraic Expressions and Identities |
Chapter-10 | Visualizing Solid Shapes |
Chapter-11 | Mensuration |
Chapter-12 | Exponents and Powers |
Chapter-13 | Direct and Inverse Proportions |
Chapter-14 | Factorization |
Chapter-15 | Introduction to Graphs |
Chapter-16 | Playing with Numbers |
Comprehensive Coverage: Solutions for maths chapter 6 class 8 cover all topics and concepts related to squares, square roots, and their properties as per the Class 8 syllabus.
Step-by-Step Solutions: Detailed step-by-step explanations for each problem, making it easy for students to understand and apply mathematical concepts.
Illustrations and Diagrams: Inclusion of diagrams, figures, and illustrations to visually explain properties and methods related to squares and square roots ch 6 maths class 8.
Also Check NCERT Books and NCERT Syllabus here:
Properties of square numbers, finding the square of a number, Pythagorean triplets, finding square roots by different methods are the important topics this chapter.
No, CBSE doesn't provide NCERT solutions for any class and subject.
Here you will get the detailed NCERT solutions for class 8 by clicking on the link.
Here you will get the detailed NCERT solutions for class 8 maths by clicking on the link.
NCERT solutions are helpful for the students if they are not able to solve NCERT problems. Also, they will get the new ways to solve the problems.
CBSE class 8 maths is simple and basic maths. Most of the topics related to the previous classes.
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