Some examples will provide a better understanding than a definition.
We say addition is the opposite operation of subtraction and subtraction is the opposite operation of division.
Also multiplication is the opposite operation of division and division is the opposite of multiplication.
examples:5+5=10
10-5=5 <-- opposite operation
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Another name for opposite operations is inverse operations.
The opposite of dilation in math is contraction
Inverse Operations
Inverse Operations.
Inverse operations are opposite operations that undo each other. Addition and subtraction are inverse operations. Multiplication and division are inverse operations.