Neriah
Unit Digits of Squares First we need to remember unitdigits of all squares from 1 to 10. The figure below shows the unit digits of the squares.
Now from the picture we can say that, whenever the unit digit of a number is 9, unit digit of the square root of that number will be definitely 3 or 7. Similarly, this can be applied to other numbers with different unit digits
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Abrarkhan1
1.divide ur number into perfect square factor: ex : the factors of 8 are 2 and 4 2×4=8 thus the perfect square root of 400 25×16=400
Answers & Comments
First we need to remember unitdigits of all squares from 1 to 10. The figure below shows the unit digits of the squares.
Now from the picture we can say that, whenever the unit digit of a number is 9, unit digit of the square root of that number will be definitely 3 or 7. Similarly, this can be applied to other numbers with different unit digits
ex : the factors of 8 are 2 and 4
2×4=8
thus the perfect square root of 400
25×16=400
example 2.