The temperature was -5 degrees. Then the temperature rose 5 degrees.
Question 2
2.
A climber was 30 feet above sea level. Then she descended 30 feet.
Question 3
3.
Running 150 feet east.
Question 4
4.
Jumping down 10 steps.
Question 5
5.
Pouring 8 gallons into a fish tank.
A mountaineer is climbing on a cliff. She is 200 feet above the ground. If she climbs up, this will be a positive change. If she climbs down, this will be a negative change.
Question 6
6.
Complete the table.
Write an addition equation and draw a number line diagram for B. Include the starting elevation, change, and final elevation in your diagram.
A spelunker is down in a cave next to the cliff. If she climbs down deeper into the cave, this will be a negative change. If she climbs up, whether inside the cave or out of the cave and up the cliff, this will be a positive change.
Question 7
7.
Complete the table.
Write an addition equation and draw a number line diagram for C and D. Include the starting elevation, change, and final elevation in your diagram.
Question 8
8.
​What does the expression -45+60 tell us about the spelunker? What does the value of the expression tell us?
Question 9
9.
-35 + (30 + 5)
Question 10
10.
-0.15 + (-0.85) + 12.5
Question 11
11.
\frac{1}{2}+(-\frac{3}{4})
Your teacher will give you a long strip of paper.
Follow these instructions to create a number line.
Fold the paper in half along its length and along its width.
Unfold the paper and draw a line along each crease.
Label the line in the middle of the paper 0. Label the right end of the paper + and the left end of the paper -.
Select two objects of different lengths, for example a pen and a gluestick. The length of the longer object is a and the length of the shorter object is b.
Use the objects to measure and label each of the following points on your number line.
a
b
2a
2b
a+b
-a
-b
a+-b
b+-a
Complete each statement using <, >, or =. Use your number line to explain your reasoning.