Question

what could be the possible unit digit of the square root of a square number​

Answer 1

Explanation: Since 12 and 92 give 1 at unit's place, so these are the possible values of unit digit of the square root. Explanation: Since, 52 = 25, hence 5 is possible.

Answer 2

Answer:

If a number has 1 or 9 in the unit's place, then its square ends in 1

When a square number ends in 6,the number whose square it is,will have either 4 or in unit's place

When a square number ends in 9,the number whose square it is,will have either 3 or 7 in units place

When a square number ends in 5,the number whose square it is ,will have 5 in units place

When a square number ends in 4 ,the number whose square it is, will have either 2 or 8 in units place