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the answer is divide by 4

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Divide by4

Q: What is the reverse of multiply by 4?

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

Divide by 9

multiply by -1...

multiply by 1/38

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

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21978

2178 x 4 = 8712

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

multiply by -1...

Divide by 9

Multiply by 36

multiply by 1/38

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

divide by 21

- * - = + - * + = - + * + = + - / - = + - / + = - + / + = + *= multiply /=divide

Divide by 622.

Try the reverse. 4 times 5 equals what? What=X. Problem:X/4=5. Multiply both sides by 4. 4X/4=4*5(4/4=1, it goes away). X=20