Q: What is the reverse of multiply by 21?

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The reverse, in the sense of undoing the effects of "divide by 21" is "multiply by 21".

21 multiply by 10 = 210

the reverse would be to divide by 5 or the inverse would be to multiply by 1/5 (both answers are mathematically the same)

365 multiply by 24 then multiply that answer by 21 and it is 183960

multiply by -1...

Divide by 9

Multiply by 36

multiply by 1/38

How about: 3*7 = 21 or 1*21 = 21

You can do 7 times 3 and that will equal 21

26775

Any number can be multiplied by 21

21

1 and 21 3 and 7

It is: 21*21 = 441

42

1

-17

You multiply 21 times itself three times: 21 x 21 x 21 = 9,261.

Divide 21 by 100, and then multiply by 200.

1 21 7 3 are the factors

21 multiplies to 21 to make it 441

To square a number, you multiply it by itself. In this case, 21 x 21 is 441

Always.

Divide by 622.

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