Question

write the possible units digit of the square roots of the following numbers. which of these numbers have odd square roots?
1) 9801

2)6400



please answer this question with step by step explanation.

Answer 1

Answer of 9801 : 1 and 9.
Explanation: Since 12 and 92 give 1 at unit’s place, so these are the possible values of unit digit of the square root
Answer of 6400 :Square root of 6400 = 80 as square of 80 is 6400.

Answer 2

Step-by-step explanation:

1) 9801

= Since, unit digit of 9801 is 1

∴ ∴ Unit digit of square root = 1 or 9

Since, the number is odd,

square root is also odd