Task 2:
1. Can 123456 be a perfect square? Explain why or why not.
2. A square number has a last digit of 9. What could be its square root?
Answer (2)
123456 cannot be a perfect square because its square root is not an integer. A square number with a last digit of 9 can have a square root whose last digit is either 3 or 7. ;
123456 cannot be a perfect square because its square root is not an integer. A square number that ends with a last digit of 9 can have a square root with last digits of either 3 or 7, as both 3 squared and 7 squared end in 9. Therefore, the last digits of potential square roots are 3 or 7.
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