The index of a number says how many times to use the number in a multiplication.

It is written as a small number to the right and above the base number.

In this example: 8

The plural of index is indices.

(Other names for index are

It is written as a small number to the right and above the base number.

In this example: 8

^{2}= 8 × 8 = 64The plural of index is indices.

(Other names for index are

**exponent**or**power**.)