Skill: Locate whole numbers on a number line

A number line shows numbers in order from left to right. Start at $0$. Equal spaces mean equal changes in value.

To locate a number:

1. Find $0$.
2. Look at the labels to see what each step is worth.
3. Count the equal intervals to the right until you reach the number.

Example: What number does point $P$ show?

The number line goes from $0$ to $100$ and is divided into $10$ equal intervals:

0    |    |    |    P    |    |    |    |    |    100

Step 1: Find the value of each interval.

There are $10$ equal intervals from $0$ to $100$:

$$100 \div 10 = 10$$

So, each step is $10$.

Step 2: Count from $0$ to point $P$:

$$10,\ 20,\ 30,\ 40$$

Point $P$ is at $40$.

$$\boxed{P=40}$$