Year 7 Interactive Maths - Second Edition

Writing Numbers in Index Form

So, we can write 8 as 2³.

Likewise, 27 can be written as 3³
and 125 can be written as 5³. 

So far, we have considered numbers that have a group of the same factors. Sometimes, a number has more than one group of the same factors as shown in the following example.

Example 20

Write 200 in simplest index form.

Solution:

Key Term

simplest index form