1.

Find the square of 71.1. 56612. 50413. 51614. 50915. None of these.

Answer» Correct Answer - Option 2 : 5041

Concept used:

Calculation skills trick.

Calculation:

Step - 1

Write down the squares of each of the digits in two digit format i.e. 72 = 49 and 12 = 01

The number obtained after this step is 4901.

Step – 2

Multiply the digits with each other and also with the power 2 i.e. 7 × 1 × 2 = 14

Step – 3

Add the number obtained in step - 1 with the number obtained in step – 2 keeping the unit place empty i.e.

4 9 0 1

_ 1 4 _

5 0 4 1

This is our final answer.



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