Double number lines
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Lesson details
Key learning points
- In this lesson, we will understand how to use double number lines to represent proportion problems.
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5 Questions
Q1.
Fill in the gap: the diagram shows a triangle that has been _________ by a scale factor of 3.5.
bigger
proportionality
ratio
Q2.
Fill in the gap: the ratio between the side lengths AB and BC is 2 : ____.
10.5
2
ratio
Q3.
Fill in the gaps: The _______ between the side length DE and EF is also 2 : ___.
proportionality, 10.5
proportionality, 3
ratio, 10.5
Q4.
Fill in the gap: The constant of _________ between the two triangles is 3.5.
bigger
enlargement
ratio
Q5.
What is the length of DE?
6cm
70cm
9.5cm
5 Questions
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?
18
24
9
Q2.
On a double number line, 10 is above the line and 40 is below the line. What is the constant of proportionality?
1
10
40
Q3.
On a double number line, 4 is above the line and 4.8 is below the line. What is the constant of proportionality?
0.8
4
4.8
Q4.
What is the missing number (indicated by the empty box) on this number line?
0.6
16
8
Q5.
What is the constant of proportionality for this number line?
0.6
16
8