A quick recap on types of numbers

Natural Numbers

$$\mathbb{N}$$

Counting with at least 1 object.

Example:

Length of a football field.

Whole Numbers

$$\mathbb{W}$$

Counting that can include 0 objects

Example:

How many cakes do I have?

Integers

$$\mathbb{Z}$$

Counting where negative numbers is possible.

Example:

How much money I have in my bank account

Rationals

$$\mathbb{Q}$$

Outcomes which are represented as a ratio between 2 numbers.

Example:

Conversion between metric and imperial

Real Numbers

$$\mathbb{R}$$

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. $\mathbb{Q}$ $\mathbb{R}$