Divide by 4.
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".
The opposite of multiplying by 4 is dividing by 4. When you divide a number by 4, you essentially reverse the effect of multiplying that number by 4. For example, if you multiply 8 by 4 to get 32, dividing 32 by 4 brings you back to 8.
divide by 21
- * - = + - * + = - + * + = + - / - = + - / + = - + / + = + *= multiply /=divide
Divide by 622.