An inverse is something that is opposite or contrary in position, direction, order, or effect.
If I have nine things and acquire seven more things, I have sixteen things.
The opposite of that is if I have sixteen things and give away seven things, I am left with nine things.
9 + 7 = 16
16 - 7 = 9
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Inverse Operations
Because they can both have variables.
Addition is the inverse operation of subtraction and multiplication is the inverse operation of division. The word inverse means "opposite".
Inverse Operations: Divison undoes multiplication. Addition undoes subtraction. Subtraction undoes addition. Multiplication undoes division.
Subtraction is the inverse operation to addition. Multiplication is repeated addition.Division is the inverse of multiplication.