1. 1-5 Adding and Subtracting Real Numbers

2. Problem 1: Using a Number Line
Use a number line to find 3 + 5 1 2 3 4 5 6 7 8

3. Use a number line to find 3 + (– 5) -4 -3 -2 -1 1 2 3 4

4. Use a number line to find – 3 + (– 5) -4 -3 -2 -1 1 2 3 4

5. Problem 2: Adding Real Numbers–
– 18 + (– 2) –
3 4 + − 5 6

6. Problem 3: Subtracting Real Numbers
To subtract an integer “change the sign add a line” then follow the adding integers rules:
Example:
3 – 5 = _____
3 – (– 5) = _____

7. What is each difference
−8− −13
3.5−12.4
9−9

8. Problem 4: Adding & Subtracting Real Numbers
A reef explorer dives 25 feet to photograph brain coral and then rises 16 feet to travel over a ridge before diving 47 feet to survey the base of the reef. Then the diver rises 29 feet to see an underwater cavern. What is the location of the cavern in relation to sea level