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".
divide by 21
21978
multiply by -1...
Divide by 9
Multiply by 36
Reverse division involves finding the original number when given a quotient and the divisor. To perform reverse division, you multiply the quotient by the divisor to obtain the original number. For example, if the quotient is 5 and the divisor is 2, then the original number is 5 × 2 = 10. This method effectively reverses the division process.
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.
1200. Reverse the operation: reverse of divide is multiply, thus 60 x 20 = 1200
Divide by 4.