Write the possible unit’s digits of the square root of the following numbers. Which of these numbers are odd square roots?
(i) 9801
(ii) 99856
(iii) 998001
(iv) 657666025
(i) 9801
Unit digit = 1
Unit digit of square root = 1 or 9
As number is odd, square root is also odd
(ii) 99856
Unit digit = 6
Unit digit of square root = 4 or 6
As number is even, square root is also even
(iii) 998001
Unit digit = 1
Unit digit of square root = 1 or 9
As number is odd, square root is also odd
(iv) 657666025
Unit digit = 5
Unit digit of square root = 5
As number is odd, square root is also odd
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