The inverse of an operation is the operation which gets you back to the number you started with.

For example, if you start with the number 6, and then add 4:

6 + 4 = 10

To get back to the 6, you have to subtract 4 from 10.

10 – 4 = 6.

Therefore **addition and subtraction** are **inverse
operations**.

Similarly, **division **is the inverse of **multiplication**,
and vice versa:

7 × 5 = 35

35 ÷ 5 = 7

The case of exponents and logarithms is slightly more complicated, since neither operation is commutative. After raising a number to a power, you can use the logarithm to get back to the exponent (not the base.)

10^{3} = 1000

log_{3}1000 ≠ 10, but

log_{10}1000 = 3