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 Are Integers?

Easy one – it just means a whole number (either positive of negative).

So -3 is an integer. 0.5 isn’t.

0 is considered to be an integer too.

### What Are Rational Numbers?

These are just numbers that can be written as fractions. They are the numbers you deal with the most. They come in three forms:

Integers
Fractions – e.g. a quarter, 3/8
Terminating or recurring decimals – e.g. 0.56, 1/8, 0.143143143143….. (which is actually 143/999).

### What Are Irrational Numbers?

These are a pain. They just keep going on forever with never ending, non-repeating decimals.

Square roots of positive numbers are either integers or irrational.

The most famous irrational number is pi. Another famous example (not famous like Kim Kardashian…unless you’re a maths teacher) is √2.

You need to make sure you know the terms so you don’t get tripped up in the exam!