Lesson 2.4 - Adding Integers

8/14/2019 Lesson 2.4 - Adding Integers

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Five-Minute Check (over Lesson 23)Main Idea and Vocabulary

Example 1:Add Integers with the Same Sign

Key Concept:Add Integers with the Same Sign

Example 2:Add Integers with the Same SignKey Concept:Additive Inverse Property

Example 3:Add Integers with Different Signs


Key Concept:Add Integers with Different Signs



Example 7:Use the Additive Inverse Property

Example 8:Use Integers to Solve a Problem
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opposites

additive inverse

Add integers.


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Add Integers with the Same Sign

Find 6 + (3).Use a number line.

Answer: So, 6 + (3) = 9.

From there, move 3 units left to show 3.Move 6 units left to show 6.

Start at 0.


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1. A

2. B3. C4. D

A B C D

0% 0%0%0%

A. 7

B. 3

C. 3

D. 7

Find 5 + (2).


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Add Integers with the Same Sign

Find 34 + (21).

34 + (21) = 55 Both integers are negative,so the sum is negative.

Answer: 55


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1. A

2. B3. C4. D

A B C D

%0 %0%0%0

A. 46

B. 8

C. 8

D. 46

Find 27 + (19).


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Add Integers with Different Signs

Find 8 + (7).

Answer: So, 8 + (7) = 1.

Use a number line.

Then move 7 units left.Move 8 units right.

Start at zero.


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1. A

2. B3. C4. D

A B C D

%0 %0%0%0

A. 8

B. 4

C. 4

D. 12

Find 6 + (2).


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Find 5 + 4.

Answer: So, 5 + 4 = 1.


Use a number line.

Then move 4 units right.Move 5 units left.

Start at 0.


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1. A

2. B3. C4. D

A B C D

0% 0%0%0%

A. 8

B. 2

C. 8

D. 15

Find 3 + 5.


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Find 2 + (7).

Answer: 5


2 + (7) = 5 Subtract absolute values;7 2 = 5. Since 7 hasthe greater absolute value,the sum is negative.


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1. A

2. B3. C4. D

A B C D

%0 %0%0%0

A. 14

B. 4

C. 4

D. 14

Find 5 + (9).


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Find 9 + 6.

Answer: 3


9 + 6 = 3 Subtract absolute values;9 6 = 3. Since 9 has thegreater absolute value, thesum is negative.


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1. A

2. B3. C4. D

A B C D

%0 %0%0%0

A. 10

B. 4

C. 4

D. 10

Find 7 + (3).


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Find 11 + (4) + (11).

Answer: 4

Use the Additive Inverse Property

11 + (4) + (11) = 11 + (11) + (4) CommutativeProperty (+)

= 0 + (4) Additive InverseProperty

= 4 Identity Propertyof Addition


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Use Integers to Solve aProblem

OCEANOGRAPHY Oceanographers divide the oceaninto three light zones. The deeper the water, the lesslight shines through. The middle zone is called theTwilight Zone. The lowest part of this zone is 1,000meters below the surface of the water. The top of thiszone lies 800 meters above the lowest zone. What isthe depth of the top of the zone? Write an additionsentence to describe this situation. Then find thesum and explain its meaning.

1,000 + 800 = 200Answer: The depth of the top of the middle zone is

200 meters below the surface of the water.


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End of the Lesson

Pg 98-99, # 1-6 all,10-42 even.


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Five-Minute Check (over Lesson 23)

Image Bank

Math Tools

Adding Integers

Comparing and Ordering Integers

Subtracting Positive and Negative Integers
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1. A

2. B3. C4. D

A B C D

%0 %0%0%0

(over Lesson 2-3)

A. (3, 3), I

B. (3, 3), II

C. (3, 3), III

D. (3, 3), IV

Name the ordered pair for thepoint C . Then identify thequadrant in which the point C lies.


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1. A

2. B3. C4. D

A B C D

0% 0%0%0%

(over Lesson 2-3)

A. (3, 2), III

B. (2, 3), I

C. (2, 3), II

D. (3, 2), II

Name the ordered pair for thepoint L . Then identify the quadrantin which the point L lies.


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1. A

2. B3. C4. D

A B C D

0% 0%0%0%

(over Lesson 2-3)

A. (3, 3), I

B. (3, 3), IV

C. (3, 3), I

D. (3, 3), IV

Name the ordered pair for thepoint S . Then identify the quadrantin which the point S lies.


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1. A

2. B3. C4. D

A B C D

0% 0%0%0%

(over Lesson 2-3)

Which choice shows the graph of the point W (4, 2)?

A. B.

C. D.


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1. A

2. B3. C4. D

A B C D

%0 %0%0%0

(over Lesson 2-3)

Which choice shows the graph of the point N (3, 0)?

A. B.

C. D.


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Lesson 2.4 - Adding Integers

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