Question

Use the properties of the perfect
squares, evaluate the following:
(210)2 – (209)​

Answer 1

Answer:

In perfect squares, the digits at the unit's place are always 0, 1, 4, 5, 6 or 9. The numbers having 2, 3, 7 or 8 at its units' place are not perfect square numbers. Property 2 : If a number has 1 or 9 in the unit's place then its square ends in 1.