# Remember index laws

They should label the index/indices/power rule, - "Try simple numbers you know first."

All you have to remember are three of the index laws, because the rest can be worked out using simple numbers.

A positive is multiply    a^n\=(a)(a) ... ... . (a)^n  ..................... Law 1

A negative is divide  a^-n\=1/a^n   ............................................... Law 2

A fraction is a root       a^(1/n)=rootna  ................................................ Law 3

But the number one rule with indices/powers is:

Try simple numbers you know first

To help remember these try simple numbers you know first.

10^2=10\times10=100

10^-2=1/10^2=1/(10\times10)=0.01

10^(1/2)=root2(10)=3.162

And use simple numbers you know first for all the others to work out the remaining rules.