Question

Answer with full explanation​

Answer 1

Ex 6.1

1)

In question number 1. Just square the digit at units place and you will get the digit at units place.

Example 24² : 4² = 16 , hence the square of 24 will have 6 as its unit digit.

Similarly you can do all other questions.

2)

See this question is very easy as the numbers which are a perfect square has 0, 1 , 4, 5, 6 , 9 as its unit digit. Numbers which have unit digits other than the above one can never be a perfect square.

Note : Number ending with 0, 1 , 4 , 5 , 6 , 9 may or may not be perfect square.