# The Number Line

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## Overview

Tools help us do jobs. Look at these tools.

A pencil is a tool. It is used to write down information. A pair of scissors is a tool. It can cut paper, string, and paper.

We use tools in math too.

A pencil is a math tool. We use it to write numbers and draw shapes. The ruler is a math tool. We use it to measure objects and draw lines.

The picture below is a math tool! It is called a number line. A number line has a line. A number line has dots that are called points. A number line also has numbers.

Some number lines use tick marks instead of points. Tick marks are short lines. Here is a number line with a tick mark.

This number line is missing a number. Put your finger on zero and start counting.
0, 1, 2, 3, 4, 5. What number comes after 5? It is 6.

8 + 2.

Start at 0. The first number is 8. Jump to 8. To show a jump, draw a hill. Next, add 2. Start at 8. Count and jump at the same time. Jump 1. Jump 2. We stopped at 10.

8 + 2 = 10

Let’s subtract

4-2.

Start at 4. Next, subtract 2. When we subtract we jump backwards on the number line. Count and jump at the same time. Jump 1. Jump 2. We stopped at 2.

4 – 2 = 2

### Practice Question 1

Look at the number line. What number is missing?

First, put your finger on zero and start counting. 0, 1, 2, 3, 4, 5, 6, 7 What number comes after 7? It is 8.

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Check your work after you have found your answer. Start at 0 and count up. Are the numbers in order?
TIP:

### Practice Question 2

Use the number line to solve the addition problem: 6 + 1

Start at 0. The first number is 6. Jump to 6. To show a jump, draw a hill. Next, add 1. Start at 6. Count and jump at the same time. Jump 1. We stopped at 7.

6 + 1 = 7.

### Practice Question 3

Look at the number line. What number is missing?

Remember to start at 0 and count up.

### Practice Question 4

Use the number line to solve the addition problem: 5 + 2

Start at 0. The first number is 5. Jump to 5. To show a jump, draw a hill. Next, add 2. Start at 5. Count and jump at the same time. Jump 1. Jump 2. What number did you stop at?

### Practice Question 5

Use the number line to solve the subtraction problem: 18 – 3

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