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Example 1 Add Integers on a Number Line Example 2 Add Integers with the Same Sign Example 3 Add Integers on a Number Line Example 4 Add Integers with Different Sig ns Example 5 Use Integers to Solve a Problem Example 6 Add Three or More Integers

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Page 1: Lesson 2 Contents Example 1Add Integers on a Number Line Example 2Add Integers with the Same Sign Example 3Add Integers on a Number Line Example 4Add Integers

Example 1 Add Integers on a Number Line

Example 2 Add Integers with the Same Sign

Example 3 Add Integers on a Number Line

Example 4 Add Integers with Different Signs

Example 5 Use Integers to Solve a Problem

Example 6 Add Three or More Integers

Page 2: Lesson 2 Contents Example 1Add Integers on a Number Line Example 2Add Integers with the Same Sign Example 3Add Integers on a Number Line Example 4Add Integers

Find .

Start at zero.

Move three units to the right.

From there, move four more units to the right.

Answer:

3 4

Page 3: Lesson 2 Contents Example 1Add Integers on a Number Line Example 2Add Integers with the Same Sign Example 3Add Integers on a Number Line Example 4Add Integers

Find .

Answer: –7

Page 4: Lesson 2 Contents Example 1Add Integers on a Number Line Example 2Add Integers with the Same Sign Example 3Add Integers on a Number Line Example 4Add Integers

Find .

Answer: –9

Add and . Both numbers are

negative, so the sum is negative.

Page 5: Lesson 2 Contents Example 1Add Integers on a Number Line Example 2Add Integers with the Same Sign Example 3Add Integers on a Number Line Example 4Add Integers

Answer: –11

Find .

Page 6: Lesson 2 Contents Example 1Add Integers on a Number Line Example 2Add Integers with the Same Sign Example 3Add Integers on a Number Line Example 4Add Integers

Find .

Start at zero.

Move 7 units to the right.

From there, move 11 units to the left.

Answer:

7–11

Page 7: Lesson 2 Contents Example 1Add Integers on a Number Line Example 2Add Integers with the Same Sign Example 3Add Integers on a Number Line Example 4Add Integers

Find .

Start at zero.

Move 2 units to the left.

From there, move 9 units to the right.

Answer:

–29

Page 8: Lesson 2 Contents Example 1Add Integers on a Number Line Example 2Add Integers with the Same Sign Example 3Add Integers on a Number Line Example 4Add Integers

Find each sum.

a.

b.

Answer: 3

Answer: –3

Page 9: Lesson 2 Contents Example 1Add Integers on a Number Line Example 2Add Integers with the Same Sign Example 3Add Integers on a Number Line Example 4Add Integers

Find .

Answer: 1

To find –9 + 10, subtract from .

The sum is positive because

Page 10: Lesson 2 Contents Example 1Add Integers on a Number Line Example 2Add Integers with the Same Sign Example 3Add Integers on a Number Line Example 4Add Integers

Answer: –7

Find .

To find 8 + (–15), subtract from

The sum is negative because

Page 11: Lesson 2 Contents Example 1Add Integers on a Number Line Example 2Add Integers with the Same Sign Example 3Add Integers on a Number Line Example 4Add Integers

Find each sum.

a.

b.

Answer: –3

Answer: 5

Page 12: Lesson 2 Contents Example 1Add Integers on a Number Line Example 2Add Integers with the Same Sign Example 3Add Integers on a Number Line Example 4Add Integers

Words The temperature at dawn was –22°F. It had risen 19 degrees by noon. What was the temperature at noon?

Weather On February 1, the temperature at dawn was –22°F. By noon it had risen 19 degrees. What was the temperature at noon?

Temperatureat dawn plus increase

by noon equals temperature at noon.

19–22Equation x

Variable Let x the temperature at noon.

Page 13: Lesson 2 Contents Example 1Add Integers on a Number Line Example 2Add Integers with the Same Sign Example 3Add Integers on a Number Line Example 4Add Integers

Solve the equation.

To find the sum, subtract

Answer: The temperature at noon was –3°F.

The sum is negative because

Page 14: Lesson 2 Contents Example 1Add Integers on a Number Line Example 2Add Integers with the Same Sign Example 3Add Integers on a Number Line Example 4Add Integers

Hiking Dave started his hike at 32 feet below sea level. During the hike he gained an altitude of 29 feet. At what altitude did Dave complete his hike?

Answer: Dave completed his hike at 3 feet below sea level.

Page 15: Lesson 2 Contents Example 1Add Integers on a Number Line Example 2Add Integers with the Same Sign Example 3Add Integers on a Number Line Example 4Add Integers

Commutative Property

Additive Inverse Property

Identity Property of Addition

Answer: –4

Find .

Page 16: Lesson 2 Contents Example 1Add Integers on a Number Line Example 2Add Integers with the Same Sign Example 3Add Integers on a Number Line Example 4Add Integers

Commutative Property

Associative Property

Answer: –4

Simplify.or –4

Find .

Page 17: Lesson 2 Contents Example 1Add Integers on a Number Line Example 2Add Integers with the Same Sign Example 3Add Integers on a Number Line Example 4Add Integers

Answer: –9

Answer: 10

Find each sum.

a.

b.

Page 18: Lesson 2 Contents Example 1Add Integers on a Number Line Example 2Add Integers with the Same Sign Example 3Add Integers on a Number Line Example 4Add Integers

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