1.

Find the square of 89.1. 79712. 79213. 78814. 76415. 7791

Answer» Correct Answer - Option 2 : 7921

Concept used:

Calculation skills trick.

Calculation:

Step - 1

Write down the squares of each of the digits in two digit format i.e. 82 = 64 and 92 = 81

The number obtained after this step is 6481.

Step – 2

Multiply the digits with each other and also with the power 2 i.e. 8 × 9 × 2 = 144

Step – 3

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

6 4 8 1

1 4 4 _

7 9 2 1

This is our final answer.



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