Adding and Subtracting Integers
Instructions
For each activity below, drag the sliders to change the arrows on the number line. Use the number line to help you answer the questions below.
Adding Positive Integers
1. Using the model above, model the mathematical expressions below:
3+5
2+8
5+7
2. Using the model above, find an expression that would give the following answer:
5
4
9
Adding Negative Integers
1. Using the model above, model the mathematical expressions below:
-3 + -5
-2 + -8
-5 + -7
2. Using the model above, find an expression that would give the following answer:
-5
-4
-9
Notice
What do you notice when adding 3+5 and -3 + -5? Is there a shortcut?