1. Integers and Absolute Value
1-3
Integers and Absolute Value
Warm Up
Problem of the Day
Lesson Presentation
Course 3

2. 1-3 Integers and Absolute Value Warm Up
Course 3
Warm Up
Evaluate each expression for the given values of the variables.
1. 2x – 3y for x = 17 and y = 6
2. 5(x + 3) + 4y for x = 3 and y = 2
3. 6.9(x – 2.7) for x = 5.1
4. 5x – 4y for x = 0.3 and y = 0.2 16 38
23.66
0.7

3. 1-3 Integers and Absolute Value Problem of the Day
Course 3
Problem of the Day
Janie’s score is 3 times the sum of 1 and Maria’s score on the final exam. Maria scored 12 points. Whose score is highest?
Janie

4. 1-3 Integers and Absolute Value
Course 3
Learn to compare and order integers and to evaluate expressions containing absolute value.

5. Vocabulary 1-3 integer opposite additive inverse Absolute value
Integers and Absolute Value
Course 3
Vocabulary
integer
opposite
additive inverse
Absolute value

6. 1-3 Integers and Absolute Value
Course 3
Integers are the set of whole numbers and their opposites. On a number line, opposites, or additive inverses, are numbers that are the same distance from 0, but on opposite sides of 0 on the number line.
Course 3

7. 1-3 Integers and Absolute Value Remember!
Course 3
Numbers on a number line increase in value as you move from left to right.
Remember!

8. Additional Example 1A: Sports Application
1-3
Integers and Absolute Value
Course 3
Additional Example 1A: Sports Application
Use <, >, or = to compare the scores.
Aaron’s score is 4, and Felicity’s score is –1.
Place the scores on the number line.
–5 –4 –3 –2 – • •
–1 < 4
–1 is to the left of 4.

9. Additional Example 1B: Sports Application
1-3
Integers and Absolute Value
Course 3
Additional Example 1B: Sports Application
Use <, >, or = to compare the scores.
List the golf scores in order from the lowest to the highest. The scores are –4, 2, 5, and –3.
Place the scores on the number line and read them from left to right.
–5 –4 –3 –2 – • • • •
In order from the lowest score to the highest score, the scores are –4, –3, 2, and 5.

10. Check It Out: Additional Example 1A
1-3
Integers and Absolute Value
Course 3
Check It Out: Additional Example 1A
Use <, >, or = to compare the scores.
France’s score is –2, and Juaqin’s score is –3.
Place the scores on the number line. •
–5 –4 –3 –2 – •
–3 < –2
–3 is to the left of –2.

11. Check It Out: Additional Example 1B
1-3
Integers and Absolute Value
Course 3
Check It Out: Additional Example 1B
Use <, >, or = to compare the scores.
List the golfer’s scores in order from the lowest to the highest. The scores are –3, 1, 0, and –2.
Place the scores on the number line and read them from left to right.
–5 –4 –3 –2 – • • • •
In order from the lowest score to the highest score, they are –3, –2, 0, and 1.

12. Additional Example 2: Ordering Integers
1-3
Integers and Absolute Value
Course 3
Additional Example 2: Ordering Integers
Write the integers 8, –5, and 4 in order from t least to greatest.
Compare each pair of integers.
8 > –5, 8 > 4, and –5 < 4
–5 is less than both 4 and 8.
–5, 4, and 8.

13. Check It Out: Additional Example 2
1-3
Integers and Absolute Value
Course 3
Check It Out: Additional Example 2
Write the integers 7, –12, and 13 in order from least to greatest.
Compare each pair of integers.
13 > –12, 13 > 7, and –12 < 7
–12 is less than both 7 and 13.
–12, 7, and 13.

14. 1-3 Integers and Absolute Value
Course 3
A number’s absolute value is its distance from 0 on a number line. Absolute value is always positive because distance is always positive. “The absolute value of –4” is written as –4 . Additive inverses have the same absolute value.
4 units 4 units
–5 –4 –3 –2 –
–4 = 4 = 4.
Both 4 and –4 are 4 units from 0.

15. Additional Example 3: Finding Additive Inverses
1-3
Integers and Absolute Value
Course 3
Additional Example 3: Finding Additive Inverses
Find the additive inverse of each integer.
A. 6 –6
–6 is the same distance from 0 as 6 is on the number line.
B. –14 14
14 is the same distance from 0 as –14 is on the number line.
C. 0.5
–0.5
–0.5 is the same distance from 0 as 0.5 is on the number line.

16. Check It Out: Additional Example 3
1-3
Integers and Absolute Value
Course 3
Check It Out: Additional Example 3
Find the additive inverse of each integer.
A. 12
–12
–12 is the same distance from 0 as 12 is on the number line.
B. –1.9
1.9
1.9 is the same distance from 0 as –1.9 is on the number line.
C. 1 –1
–1 is the same distance from 0 as 1 is on the number line.

17. Additional Example 4: Evaluating Absolute-Value Expressions
1-3
Integers and Absolute Value
Course 3
Additional Example 4: Evaluating Absolute-Value Expressions
Evaluate each expression.
A. –8 + –5
–8 = 8
–8 is 8 units from 0.
–5 = 5
–5 is 5 units from 0.
8 + 5 = 13
B. 5 – 6
–1 = 1
–1 is 1 units from 0.

18. Check It Out: Additional Example 4
1-3
Integers and Absolute Value
Course 3
Check It Out: Additional Example 4
Evaluate each expression.
A. –
–2 = 2
–2 is 2 units from 0.
–9 = 9
–9 is 9 units from 0.
2 + 9 = 11
B. 1 – 1
0 = 0
0 is 0 units from 0.

19. 1-3 Integers and Absolute Value Lesson Quiz
Course 3
Lesson Quiz
Write the integers in order from least to greatest.
1. –17, –26, 23
2. 0, 5, –4
Evaluate each expression.
3. The sum of 3 and the additive inverse of –8
4. – –4 + –2
5. At the end of the course, your golf score was –2. Your friend’s score was 7. What is the difference between your scores?
–26, –17, 23
–4, 0, 5 11 -2 9