Question

what will be the unit digit of square
1》74
2》236
3》9821​

Answer 1

Answer:

Ans. 1)6  

Ans. 2)6

Ans. 3)1

Step-by-step explanation:

Any no. whose unit digit is 4 or 6 has 6 as the unit digit of its square.

Ex.- 4²=16

14²=196

6²=36

16²=256, etc.

So, unit digit of both 74² and 236² is 6.

Any number whose unit digit is 1 or 9  has 1 as the unit digit of its square.

Ex.- 11²=121

21²=441

9²=81

19²=361

So, the unit digit of 9821² is 1.