# A quick recap on types of numbers

## Natural Numbers

Counting with at least 1 object.

Example:

Length of a football field.

## Whole Numbers

Counting that can include 0 objects

Example:

How many cakes do I have?

## Integers

Counting where negative numbers is possible.

Example:

How much money I have in my bank account

## Rationals

Outcomes which are represented as a ratio between 2 numbers.

Example:

Conversion between metric and imperial

## Real Numbers

Quantities which are not expressible by rational numbers.

# Example questions

The structure will be: Description of counting problem + 5 different choices to choose from.

• “Number of people in room” - $\mathbb{W}$
• “Number of cells in tissue sample” - $\mathbb{N}$
• “Time taken by 100m sprint race” - Either rational numbers or real numbers. $\mathbb{Q}$ $\mathbb{R}$

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