1. Course 1
11-4
Adding Integers
Learn to add integers.

2. Adding Integers on a Number Line
Course 1
11-4
Adding Integers
Adding Integers on a Number Line
Move right on a number line to add a positive integer.
Move left on a number line to add a negative integer.

3. Adding Integers 11-4 Writing Math
Course 1
11-4
Adding Integers
Parentheses are used to separate addition, subtraction, multiplication, and division signs from negative integers.
–2 + (–5) = –7
Writing Math

4. Additional Example 1: Writing Integer Addition
Course 1
11-4
Adding Integers
Additional Example 1: Writing Integer Addition
Write the addition modeled on each number line. A. B.
+ (–4) 5 –
The addition modeled is 5 + (–4) = 1. +7
(–4)
–5 –4 –3 –2 –
The addition modeled is –4 + 7 = 3.

5. Additional Example 1: Writing Integer Addition
Course 1
11-4
Adding Integers
Additional Example 1: Writing Integer Addition
Write the addition modeled on each number line. C.
+ (–5) 3
–4 –3 –2 –
The addition modeled is 3 + (–5) = –2.

6. Adding Integers 11-4 Check It Out: Example 1
Course 1
11-4
Adding Integers
Check It Out: Example 1
Write the addition modeled on each number line. A. B.
+ (–3) 6 –
The addition modeled is 6 + (–3) = 3. +3
(–2)
–5 –4 –3 –2 –
The addition modeled is –2 + 3 = 1.

7. Adding Integers 11-4 Check It Out: Example 1
Course 1
11-4
Adding Integers
Check It Out: Example 1
Write the addition modeled on each number line. C.
+ (–7) 4
–4 –3 –2 –
The addition modeled is 4 + (–7) = –3.

8. Additional Example 2A: Adding Integers
Course 1
11-4
Adding Integers
Additional Example 2A: Adding Integers
Find the sum.
–3 + (–2)
Think:
+ (–2) –3
–6 –5 –4 –3 –2 –
–3 + (–2) = –5

9. Additional Example 2B: Adding Integers
Course 1
11-4
Adding Integers
Additional Example 2B: Adding Integers
Find the sum.
6 + (–8)
Think:
+(–8) 6
–3 –2 –
6 + (–8) = –2

10. Adding Integers 11-4 Check It Out: Example 2A Find the sum. –2 + (–4)
Course 1
11-4
Adding Integers
Check It Out: Example 2A
Find the sum.
–2 + (–4)
Think: –2
+ (–4)
–6 –5 –4 –3 –2 –
–2 + (–4) = –6

11. Adding Integers 11-4 Check It Out: Example 2B Find the sum. 3 + (–6)
Course 1
11-4
Adding Integers
Check It Out: Example 2B
Find the sum.
3 + (–6)
Think:
+ (–6) 3
–3 –2 –
3 + (–6) = –3

12. Additional Example 3: Evaluating Integer Expressions
Course 1
11-4
Adding Integers
Additional Example 3: Evaluating Integer Expressions
Evaluate y + (–2) for y = 7.
y + (–2)
Write the expression.
7 + (–2)
Substitute 7 for y. 5
Add.

13. Adding Integers 11-4 Check It Out: Example 3
Course 1
11-4
Adding Integers
Check It Out: Example 3
Evaluate z + (–4) for z = 2.
z + (–4)
Write the expression.
2 + (–4)
Substitute 2 for z. –2
Add.

14. Additional Example 4: Application
Course 1
11-4
Adding Integers
Additional Example 4: Application
A sunken ship is 12 m below the sea level. A search plane flies 35 m above the sunken ship. How far above the sea is the plane?
The ship is 12 m below the sea level and the plane is 35 m above the ship. – 23
The plane is 23 m above the sea.

15. Adding Integers 11-4 Check It Out: Example 4
Course 1
11-4
Adding Integers
Check It Out: Example 4
A sunken treasure chest is 33 m below the sea level. A search plane flies 54 m above the sunken treasure chest. How far above the sea is the plane?
The treasure chest is 33 m below the sea level and the plane is 54 m above the ship. – 21
The plane is 21 m above the sea.