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Question

Determine which digit will be at the unit’s place in the square of a number 999. 


  1. 3

  2. 6

  3. 1

  4. 4


Solution

The correct option is C

1


As per the rule of  square of a number, the unit digit for a square of number is determined by the product of the unit place digit of a given number whose square we have to find. So in the case of 999, unit place digit is 9. So the unit place digit in a square of 999 is, 9 × 9 = 81 i.e 1

So, 9992 has a digit 1 at unit place.

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