Question

find the square without actual multiplication 90
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Answer 1

Step-by-step explanation:

90²=(100-10)(100-10)

=(100×100)-(100×10)-(10×100)+(10×10)

=10000-1000-1000+100

=8100

Answer 2

Answer: 8100

Step-by-step explanation:

it easiest to multiply-

⇒ 90² = (9x10)² = 9²x10²

                            = 81 x 100

                            ⇒ 8100

It was the easiest way, other methods are possible but .............more tedious.

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