1. Warm Up
Lesson Presentation
Lesson Quizzes

2. Learn to add and subtract fractions.

3. Additional Example 1A: Adding or Subtracting Fractions with Like Denominators
Add. Write the answer in simplest form. 5 8 1 8 + 5 8 1 8
5 + 1
Add the numerators and keep
the denominator. + = 8 6 8 3 4 = =
Simplify.

4. Subtract. Write the answer in simplest form.
Additional Example 1B: Adding or Subtracting Fractions with Like Denominators
Subtract. Write the answer in simplest form. 9 11 4 11 –
Subtract the numerators and
keep the denominator. 9 11 4 11
9 – 4 – = 11 = 5 11
The answer is in the simplest
form.

5. Check It Out: Example 1A
Add. Write the answer in simplest form. 5 6 1 6 + 5 6 1 6
5 + 1
Add the numerators and keep
the denominator. + = 6 6 = = 1
Simplify.

6. Subtract. Write the answer in simplest form.
Check It Out: Example 1B
Subtract. Write the answer in simplest form. 7 10 4 10 –
Subtract the numerators and
keep the denominator. 7 10 4 10
7 – 4 – = 10 = 3 10
The answer is in the simplest
form.

7. Additional Example 1: Measurement Application3 8 5 8
Kevin is 48 inches tall. His brother Keith is 5
inches taller. How tall is Keith ?
Add the integers and add the fractions. 3 8 5 8 8 48 + 5 = 53 + 8 =
53 + 1
Rewrite
as 1.
54 inches tall.
A mixed number is the sum of an integer and a fraction: 3 =
Helpful Hint 4 5

8. Add the integers and add the fractions. 72 + 15 87 +
Check It Out: Example 1 2 3
Alvin weighs 72 lbs. His baby brother weighs lbs. How much do they weigh together? 1 3 2 3 1 3 3
Add the integers and add the fractions. 72 + 15 = 87 + 3
as 1. =
87 + 1
Rewrite
Together they weigh 88 pounds.

9. Lesson Quizzes
Standard Lesson Quiz
Lesson Quiz for Student Response Systems

10. Additional Example 2A: Adding Mixed Numbers
Add. Write the answer in simplest form. 2 3 2 3 9 + 12
Add the fractions and then add the integers. 9 2 3 + 12 =
21 + 4 3
Rewrite the improper fraction as a mixed number. Add = 1 3 = 22 1 3
Helpful Hint
Add the fractions first in case an improper fraction needs to be rewritten.

11. Lesson Quiz
Add or subtract. Write each answer in simplest form. 5 7 3 7 2 7 3 8 5 8 – + 1 1. 2. 5 12 1 2 11 12 1 3 1 12 1 4 3. + 4. – 7 8 5.
You need a nail to go through a -inch door
and extend an extra inch. How long should the nail be? 1 4
in. 1 8

12. Lesson Quiz for Student Response Systems
1. Add. Write your answer in simplest form. +
A C.
B D. 1
4 9
5 9
1 9
1 2

13. Lesson Quiz for Student Response Systems
2. Subtract. Write your answer in simplest form. –
A C.
B. or 1 D. 1
9 11
5 11
4 11
3 11
14 11
3 11
4 11

14. Lesson Quiz for Student Response Systems
3. Add. Write your answer in simplest form. +
A C.
B D. or 1
3 8
1 3
4 11
17 24
3 11
24 17
7 17

15. Lesson Quiz for Student Response Systems
4. Subtract. Write your answer in simplest form. –
A C.
B D. or 4
5 12
1 5
4 7
13 60
6 7
60 13
8 13

16. Lesson Quiz for Student Response Systems
8 9
5. You need pounds of fruits to make a
pudding. Sam has pounds of fruits. How
much more does he need to make the pudding?
A. lb C. lb
B. lb D. lb
5 12
17 24
17 36
19 24
19 36