# S-Cool Revision Summary

## S-Cool Revision Summary

## The 6 Rules

- When you
**multiply**powers of the same number you**add**the powers. - When you
**divide**powers of the same number you**subtract**the powers. - When you put a power outside a bracket you
**multiply**the powers. **Negative**powers mean**reciprocal**or 'one over.....'- When the power is a
**fraction**the top of the fraction is a**power**and the bottom of the fraction is a**root**. - Anything to the power of
**zero**is simply equal to**1**.

## Standard Form

Any number can be written in the form **a x 10 ^{n}** where

**a**is a number between

**1 and 10**and

**b**is an

**integer**.

## Indices in Algebra

Algebraic fractions can be **simplified** by following Rule 2 of Indices and taking the powers on the bottom away from the powers on the top or, in other words, **cancelling the powers**.