# Numbers

## Decimal Places And Significant Figures

Decimal places and their trickier cousins significant figures both tell you the how accurately a number should be written. We don't always need to know the abso...

## Standard Form

Standard form, or standard index form as it's sometimes called, is a really useful way of writing really big or really small numbers. It's also really popular w...

## BODMAS (or BIDMAS or PEDMAS)

Sometimes you might hear people talk about "order of operations", but what are they going on about? Well, "operations" are just what you do to numbers - things ...

## Multiples, Factors and Prime Factors

The MULTIPLES of a number are what you get when you multiply that number by an integer. To put it more simple, multiples are just a number's times table. So ...

## Lowest Common Multiple (LCM) & Highest Common Factor (HCF)

These are fairly easy, so don't get caught out by them in the exam! What Is A Lowest Common Multiple (LCM)? The lowest common multiple is just the smallest nu...

## Types Of Number

In some of the wordier questions examiners might throw in a few terms like "integer" or "irrational number", so make sure you know what these words mean! What ...

## Ratios

Ratios look like this.......and there's a few things you might be asked to do with them. Simplify A Ratio E.g. Reduce 7.2 : 6 to its simplest form. St...

## Simple and Compound Growth/Decay

Simple growth is well....simple. It basically means a percentage of the original amount is added on at certain intervals.So if £100 gains 10% simple interest a ...

## Percentages

There's a few things you might be asked to do with percentages.... Find X% of YJust turn the percentage into a decimal then multiply.So 30% of £80 = 0.3 x £8...

## Fractions and Recurring Decimals

A recurring decimal is just a decimal that repeats forever. Some fractions can only be expressed as recurring decimals. E.g. 1/3 = 0.333333333..., 24/99 = 0....