# Double number lines

In this lesson, we will understand how to use double number lines to represent proportion problems.

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.Fill in the gap: the diagram shows a triangle that has been _________ by a scale factor of 3.5.

1/5

Q2.Fill in the gap: the ratio between the side lengths AB and BC is 2 : ____.

2/5

Q3.Fill in the gaps: The _______ between the side length DE and EF is also 2 : ___.

3/5

Q4.Fill in the gap: The constant of _________ between the two triangles is 3.5.

4/5

Q5.What is the length of DE?

5/5

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.Fill in the gap: the diagram shows a triangle that has been _________ by a scale factor of 3.5.

1/5

Q2.Fill in the gap: the ratio between the side lengths AB and BC is 2 : ____.

2/5

Q3.Fill in the gaps: The _______ between the side length DE and EF is also 2 : ___.

3/5

Q4.Fill in the gap: The constant of _________ between the two triangles is 3.5.

4/5

Q5.What is the length of DE?

5/5

# Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

• Click "Close Video"
• Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

# Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

Quiz:

# Double number lines quiz

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.If a double number line starts with 4 on the top and 3 on the bottom, what will be the first number that appears both above and below the lines?

1/5

Q2.On a double number line, 10 is above the line and 40 is below the line. What is the constant of proportionality?

2/5

Q3.On a double number line, 4 is above the line and 4.8 is below the line. What is the constant of proportionality?

3/5

Q4.What is the missing number (indicated by the empty box) on this number line?

4/5

Q5.What is the constant of proportionality for this number line?

5/5

Quiz:

# Double number lines quiz

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.If a double number line starts with 4 on the top and 3 on the bottom, what will be the first number that appears both above and below the lines?

1/5

Q2.On a double number line, 10 is above the line and 40 is below the line. What is the constant of proportionality?

2/5

Q3.On a double number line, 4 is above the line and 4.8 is below the line. What is the constant of proportionality?

3/5

Q4.What is the missing number (indicated by the empty box) on this number line?

4/5

Q5.What is the constant of proportionality for this number line?

5/5

# Lesson summary: Double number lines

## Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Walk

On the spot:
Chair yoga