## 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 ...

Sometimes you might be asked to factorise expressions. Factorising is the opposite of multiplying out brackets - i.e. putting an expression into two brackets. A...

## Life On Earth, Resource and Atmosphere Change

So how did life on earth start? Well if you know that then you deserve a Nobel Prize rather than just a good mark in your exam. There's one theory you need to k...

## Evolution of The Atmosphere

The atmosphere is made up of about: 78% nitrogen 21% oxygen Small amounts of other gasses like carbon dioxide, water vapour and noble gasses It's...

## The Earth’s Structure

The Earth Is Made Up Of Different Layers THE CRUST: It's where we live! As you can see from the diagram it's pretty thin compared to the other layers. At it...