1. 1-4 Adding Integers Warm Up Problem of the Day Lesson Presentation
Course 3
Warm Up
Problem of the Day
Lesson Presentation

2. 1-4 Adding Integers Warm Up Graph each number on a number line.
Course 3
1-4
Adding Integers
Warm Up
Graph each number on a number line.
1. –
3. –
–5 –4 –3 –2 –

3. Course 3
1-4
Adding Integers
Learn to add integers.

4. Additional Example 1A: Using a Number Line to Add Integers
Course 3
1-4
Adding Integers
Additional Example 1A: Using a Number Line to Add Integers
Use a number line to find the sum.
(–6) + 2 –6 2
–6 –5 –4 –3 –2 –
You finish at –4, so (–6) + 2 = –4.
To add a positive number move to the right. To add a negative number move to the left.
Helpful Hint

5. Additional Example 1B: Using a Number Line to Add Integers
Course 3
1-4
Adding Integers
Additional Example 1B: Using a Number Line to Add Integers
Use a number line to find the sum.
–3 + (–6) –6 -3
–9 –8 –7 –6 –5 –4 –3 –2 –
You finish at –9, so –3 + (–6) = –9.

6. 1-4 Adding Integers –6 –5 –4 –3 –2 –1 0 1 2 3 4 5
Course 3
1-4
Adding Integers
Check It Out: Example 1A
Use a number line to find the sum.
(–3) + 7 –3 7
–6 –5 –4 –3 –2 –
You finish at 4, so (–3) + 7 = 4.

7. 1-4 Adding Integers –6 –5 –4 –3 –2 –1 0 1 2 3 4 5
Course 3
1-4
Adding Integers
Check It Out: Example 1B
Use a number line to find the sum.
(–2) + 4 –2 4
–6 –5 –4 –3 –2 –
You finish at 2, so (–2) + 4 = 2.

8. Additional Example 2: Using Absolute Value to Add Integers
Course 3
2-1
Adding Integers
Additional Example 2: Using Absolute Value to Add Integers
Add.
A. 1 + (–2)
1 + (–2)
Think: Find the difference of 1 and –2 . –1
2 > 1; use the sign of 2.
B. (–8) + 5
(–8) + 5
Think: Find the difference of –8 and 5 . –3
8 > 5; use the sign of 8.

9. Additional Example 2: Using Absolute Value to Add Integers
Course 3
1-4
Adding Integers
Additional Example 2: Using Absolute Value to Add Integers
Add.
C. (–2) + (–4)
(–2) + (–4)
Think: Find the sum of –2 and –4 .
Same sign; use the sign of the integers. –6

10. 1-4 Adding Integers Check It Out: Example 2 Add. A. 3 + (–6) 3 + (–6)
Course 3
1-4
Adding Integers
Check It Out: Example 2
Add.
A. 3 + (–6)
3 + (–6)
Think: Find the difference of 3 and –6 . –3
6 > 3; use the sign of 6.
B. (–4) + 1
(–4) + 1
Think: Find the difference of –4 and 1 . –3
4 > 1; use the sign of 4.

11. 1-4 Adding Integers Check It Out: Example 2C Add. C. (–6) + (–7)
Course 3
1-4
Adding Integers
Check It Out: Example 2C
Add.
C. (–6) + (–7)
(–6) + (–7)
Think: Find the sum of –6 and –7 .
Same sign; use the sign of the integers.
–13

12. Additional Example 3: Evaluating Expressions with Integers
Course 3
1-4
Adding Integers
Additional Example 3: Evaluating Expressions with Integers
Evaluate c + 4 for c = –8.
c + 4
(–8) + 4
Replace c with –8.
Think: Find the difference of –8 and 4 .
–8 + 4 = –4
8 > 4; use the sign of 8.

13. 1-4 Adding Integers Check It Out: Example 3 Evaluate d + 7 for d = –3.
Course 3
1-4
Adding Integers
Check It Out: Example 3
Evaluate d + 7 for d = –3.
d + 7
(–3) + 7
Replace d with –3.
Think: Find the difference of –3 and 7 .
–3 + 7 = 4
7 > 3; use the sign of 7.

14. Additional Example 4: Application
Course 3
1-4
Adding Integers
Additional Example 4: Application
Meka opened a new bank account. Find her account balance after the first four transactions listed below.
Deposits: $200, $20 Withdrawals: $166, $38
Use a positive sign for deposits and a negative sign for withdrawals.
(–166) + (–38)
Group integers with same signs.
( ) + (–166 + –38)
Add integers within each group.
220 + (–204)
220 > 204; use the sign of 220. 16
Meka’s account balance after the first four transactions is $16.

15. 1-4 Adding Integers Check It Out: Example 4 175 + 95 + (–133) + (–65)
Course 3
1-4
Adding Integers
Check It Out: Example 4
Michael opened a new bank account. Find his account balance after the first four transactions listed below.
Deposits: $175, $95 Withdrawals: $133, $65
Use a positive sign for deposits and a negative sign for withdrawals.
(–133) + (–65)
Group integers with same signs.
( ) + (–133 + –65)
Add integers within each group.
270 + (–198)
270 > 198; use the sign of 270. 72
Michael’s account balance after the first four transactions is $72.

16. Insert Lesson Title Here
Course 3
1-4
Adding Integers
Insert Lesson Title Here
Lesson Quiz: Part I
Add.
1. –7 + (– 7)
(–9) + (–2)
–14 4
Evaluate each expression for the given value of the variable.
r for r = –15
b + (–9) for b = –6 –2
–13

17. Insert Lesson Title Here
Course 3
1-4
Adding Integers
Insert Lesson Title Here
Lesson Quiz: Part II
5. On Monday, a local dog shelter had six dogs. By Friday they had found homes for three, but took in two more. Then how many dogs were in the shelter?
5 dogs

18. Homework
p # All due Monday
And 30 minutes on Reflex due by next Friday.