Question

How can you do 99 x 99 mentally?

Answer 1

Answer:

99 is a composite number. 99 = 1 x 99, 3 x 33, or 9 x 11

Step-by-step explanation:

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Answer 2

Answer:

let (90+9)X(90+9)

(90+9)^2

Step-by-step explanation:

8100+81+2x90x9

8181+1620

9801

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