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Question

What is the first three digits in the square of 135?


  1. 182

  2. 128

  3. 218

  4. 821


Solution

The correct option is A

182


Since the number ends in 5, we can use the shortcut to get the square of 135.

Consider the number 13 (formed by the digits of 135 excluding 5).

Multiply this number with its next number. i.e 13 x 14.

So, 13 x 14 = 182.

Thus 182 will be the first 3 digits in the square of 135.

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