Unit 2: Lesson 5-7
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Slide 1: Slide

This lesson contains 12 slides, with interactive quizzes and text slides.

## Items in this lesson

Unit 2: Lesson 5-7

#### Slide 1 -Slide

Scuba Diving
Imagine a scuba diver dives to a depth of 65 feet. Then she rises 15 feet back up toward the surface, where she stops to photograph some coral. What is the diver’s depth when she stops to take a photograph?

Why would the scuba diver need to know the depth?

#### Slide 2 -Slide

The Rule for Adding Integers with the Same Sign
To combine integers with the same sign, add their absolute values. Then give their sum the same sign as the addends.

8 + 15 =                         -8 +-15 =
23
7
-7
-23

#### Slide 3 -Drag question

The Rule for Adding Integers with the Opposite Sign
To combine integers with different signs, find their absolute values. Then subtract the lesser absolute value from the greater one. assign the sum the same sign as the number with the greater absolute value.

-8 + 15 =                   8 +-15 =
23
7
-7
-23

#### Slide 4 -Drag question

Scuba Diving
Imagine a scuba diver dives to a depth of 65 feet. Then she rises 15 feet back up toward the surface, where she stops to photograph some coral. What is the diver’s depth when she stops to take a photograph?

#### Slide 5 -Slide

The coldest temperature
The average winter temperature in Antarctica is −30°F.  The coldest temperature ever recorded was -129 degrees F. What is the difference between the 2 temperatures?

Why would we need to know the difference?

#### Slide 6 -Slide

How can we subtract
2 negative numbers?

#### Slide 7 -Mind map

Subtraction is the inverse of addition. What does that mean? How is it different from the opposite?

#### Slide 8 -Open question

The Rule for Subtracting Integers
When solving a subtraction problem with negative numbers, turn it into an addition problem by adding its opposite
Example 1: -1-(-6)

#### Slide 9 -Slide

Example 3: 6-(-1)

Example 2: -2-5

To Summarize