Question

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What will be the "one's digit" in the square of the following numbers?
(i) 1234
(ii) 26387
(iii) 52698
(v) 21222 (vi) 9106
(iv) 99880


CLASS 8 MATHS NCERT​

Answer 1

Answer:

Step-by-step explanation The one's digit of the square of a no. could be found using the the unit digit of the no. itself .So the one's digits of given no.s are :

1. 1234    : 6
2. 26387 ; 9
3. 52698 ; 4
4. 21222  ; 4
5. 9106    ; 6
6. 99880 ; 0

Answer 2

The correct answer is 6, 9, 4, 0, 4, 6.

Given: The following numbers.

To Find: One's digit of the squares of following numbers.

Solution:

So, the unit digit of squares of any number is determined by the unit digit of square of the unit digit of number.

i) 1234

Unit digit = 4

Square of unit digit = 16

So, unit digit of square of number = 6

ii) 26387

Unit digit = 7

Square of unit digit = 49

So, unit digit of square of number = 9

iii) 52698

Unit digit = 8

Square of unit digit = 64

So, unit digit of square of number = 4

iv) 99880

Unit digit = 0

Square of unit digit = 0

So, unit digit of square of number = 0

v) 21222

Unit digit = 2

Square of unit digit = 4

So, unit digit of square of number = 4

vi) 9106

Unit digit = 6

Square of unit digit = 36

So, unit digit of square of number = 6

Hence, the unit digit of squares of following numbers is 6, 9, 4, 0, 4, 6.

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