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 1/38
The reverse, in the sense of undoing the effects of "divide by 21" is "multiply by 21".
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
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
Divide by 622.