Mammoth Memory

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.

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