**Warmup**

Draw arrows on the number lines to represent the situation:â€‹

(1.) The temperature was -5 degrees. Then the temperature rose 5 degrees.

(2.) A climber was 30 feet above sea level. Then she descended 30 feet.5 degrees.

**Activity #1**

**Adding Signed Numbers by Applying Changes in Elevation. **

- Explore the applet below.

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.

- Use the information above to complete the table below.

Write an addition equation from the data above.

- On the graph below, draw a number line diagram for B. Include the starting elevation, change, and final elevation in your diagram.

**Activity #2**

** Complete a Table.**

A cave researcher 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.

- Use this information to complete the table below.

(1.) Write an addition equation for C and D:

(2.) What does the expression -45 + 60 tell tell us about the spelunker?

(3.) What does the value of the expression tell us?

**Activity #3**

** Work with Directed Numbers.**

These problems are intended to be completed WITHOUT the use of a calculator.

- Move the arrow by dragging the white point.
- Do as may problems as you can to master the concept.

**Challenge #1**

One of the particles in an atom is called an electron. It has a charge of -1. Moreover, there is a proton with a charge of +1. The charge of an atom is the sum of the charges of the electrons and the protons. Complete the table.

**Challenge #2**

**Challenge #3**

**Quiz Time**

https://www.ixl.com/math/grade-7/complete-addition-and-subtraction-equations-with-integers

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