715 Module 1 Lesson 3 Exit Slip
Subtracting Integers (7.NS.1)
Name:______________________ Date:__________
Felgenhauer
Krueger
Model using integer chips.
1. 5 – 8 = ________
Model using the number line given.
2. -3 – (-5) = __________
3. -17 – 1 = ___________
Solve.
4. -87 – (-87) = __________
5. Explain the Error.
When Tom found the difference -11 – (-4), he got -15. What might Tom have done wrong?
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6. A scientist conducts three experiments in which she records the temperature of some gases that are
being heated. The table shows the initial temperature and the final temperature for each gas.
Gas
Initial
Temperature
Final
Temperature
A
B
C
-21o C
-8oC
-12oC
12o C
-19o C
-15oC
a. Write a difference of integers to find the overall temperature change for each gas.
Gas A: ______________________________________________________________
Gas B: ______________________________________________________________
Gas C: ______________________________________________________________
b. Suppose the scientist performs an experiment in which she cools the three gases. Will the
changes in temperature be positive or negative for this experiment.
_______________________
Explain why: ___________________________________________________________________
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Answers: 1. -3
2. 2
3. -18
6a) Gas A: -8 –(-21) = 13
Gas B: 12 – (-12) = 24
Gas C: -15 – (-19) = 4
4. 0
5.Tom found -11 – 4 instead of -11 – (-4)
6b) Negative.
Explanations will vary