Opposite operations are two operations that undo each other.
Addition and subtraction are opposite operations because adding a number and subtracting the same number will give you the value you started with.
Example
6 + 2 = 8
8 - 2 = 6
Multiplication and division are opposite operations
8 × 3 = 24
24 ÷ 3 = 8
Exponentiation and taking roots are opposite operations
Square root
92 = 81
√81 = 9
Cube root
23 = 8
Cube root of 8 = 2