Materials scissors and tape or figure from Intervention Lesson F21.
- 10 -9-8-7-6-5-4-3 -2 -1 0
1
2
3
4
5
6
7
8
9
10
1. Cut out the figure in the lower right corner of the page.
Fold on the dashed line, and tape closed.
Subtracting Integers
on the Number Line
2. Place the figure in the starting position, at zero.
To subtract -2 - 5, move the figure
backward 2 spaces to -2. Turn around
for the subtraction. To do this, flip the
figure over. Then move it forward (the
direction the figure is now facing)
5 spaces to -7.
• Always start at zero,
facing the positive
numbers.
• Move forward for
positive numbers.
• Move backward for
negative numbers.
Turn around for the
subtraction sign.
So-2 - 5 =
3.
Use the figure to find – 3 – 2.