Question

1. What will be the unit digit of the squares of the following numbers-
(ii) 799
(ii) 272
(i) 81

Answer 1

1. 799 =
2. 272 = 2 to the power 4 × 17
3. 81 = 3 to the power 4

Answer 2

Answer:

1. 1 (i.e. 9×9=81)
2. 4 (i.e. 2×2=4)
3. 1. (i.e. 1×1= 1)

just square the unit digit of the given number and check it's unit digit

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