Do Now 1/14/10Do Now 1/14/10 Take out HW from night.Take out HW from night.

Text p. 228, #10-50 evensText p. 228, #10-50 evens

Copy HW in your planner.Copy HW in your planner. Text p. 234, #12-50 evensText p. 234, #12-50 evens Quiz sections 5.1 - 5.3 WednesdayQuiz sections 5.1 - 5.3 Wednesday

In your notebook, rewrite the variable expressions with a In your notebook, rewrite the variable expressions with a common denominator.common denominator.

24

3,

5

2

abb

a

HomeworkTextbook p 228228, #10-50 evens

10) 1 2/5 12) -1 1/9 14) 1/3 16) -5/11 18) -1 1/2 20) 14 1/5 22) 5 3/11 24) -5 1/4 26) -1/7 28) 4 1/3 cups 30) t

32) 4/s 34) -4m/21 36) -9/d 38) 1 5/9 40) -1 42) -2 3/31 44) 2 ft, 8 1/2 in 46) 2/7 48) 1/6 50) 3/4

Objective

SWBAT add and subtract unlike fractions.

Section 5.2 “Adding and Subtracting Like Fractions”Section 5.2 “Adding and Subtracting Like Fractions”

Adding Fractions with Common Denominators

To ADD fractions with common denominators, add their numerators together.

7

3

7

2

7

5

7

3

7

2

Add the numerators

c

ba

c

b

c

a

Section 5.2 “Adding and Subtracting Like Fractions”Section 5.2 “Adding and Subtracting Like Fractions”

Subtracting Fractions with Common Subtracting Fractions with Common DenominatorsDenominators

To SUBTRACT fractions with common denominators, subtract their numerators.

6

1

6

5

3

2

6

4

Subtract the numerators

c

ba

c

b

c

a

Fractions with Different DenominatorsFractions with Different Denominators

To To ADDADD or or SUBTRACTSUBTRACT fractions with different fractions with different denominators follow these steps:denominators follow these steps:

1. 1. Rewrite the fractions using a common denominatorRewrite the fractions using a common denominator. .

2. 2. Add or subtract the numeratorsAdd or subtract the numerators. .

7

1

5

2 35

14

75

72

5

2

55: 5, 10, 15, 20, 25, 30, : 5, 10, 15, 20, 25, 30, 3535, 40, 4077: 7, 14, 21, 28, : 7, 14, 21, 28, 3535, 42, 42

35

5

57

51

7

1

What is the common

denominator?

35

19

35

5

35

14

Section 5.3 “Adding and Subtracting Unlike Fractions”Section 5.3 “Adding and Subtracting Unlike Fractions”

Try It Out!!Solve

21

17

21

14

21

3

44

35

44

11

44

24

20

2

5

4

6

5

12

10

12

3

12

7

10

9

20

18

20

2

20

16

3

2

7

1

4

1

12

7

4

1

11

6

““Adding and Subtracting Mixed Numbers”Adding and Subtracting Mixed Numbers”

Mixed Numbers with Different DenominatorsMixed Numbers with Different Denominators

To To ADDADD & & SUBTRACT SUBTRACT mixed numbers do the following:mixed numbers do the following:

1. Write the fractions as improper fractions1. Write the fractions as improper fractions

2. Write fractions using the LCD.2. Write fractions using the LCD.

3. Add or subtract the numerators3. Add or subtract the numerators

4. Simplify if necessary4. Simplify if necessary

11

62

5

24

11

28

5

22

55

526

55

140

55

242

55

382

Try It OutTry It Out

8

31

4

14

2.2. Write fractions using LCD.Write fractions using LCD.

8

11

8

34

8

72

8

233. Simplify3. Simplify

8

11

4

17

1.1. Improper fractionsImproper fractions

Try It Out!!Try It Out!!

6

57

4

110

12

94

12

123

12

118

12

217

6

47

4

41

2.2. Write fractions using LCD.Write fractions using LCD.

3. Simplify3. Simplify

1.1. Improper fractionsImproper fractions

Rewrite the variable expressions with a common

denominator.24

3,

5

2

abb

a

Find the LCD for 5b and 4ab². Find the LCD for 5b and 4ab². LCD = 20ab²

Rewrite equivalent fractions using the LCD. Rewrite equivalent fractions using the LCD.

22 20

?

4

3

abab

220

?

5

2

abb

a

222 20

15

54

53

4

3

ababab

2

2

20

8

45

42

5

2

ab

ba

abb

aba

b

a

Remember this?

Remember this?

Simplify the Expression.62

aa

Find the LCD for 2 and 6. Find the LCD for 2 and 6. LCD = 6

Rewrite equivalent fractions using the LCD. Rewrite equivalent fractions using the LCD.

6

?

2

a

66

3 aa

6

3

32

3

2

aaa

36

2

6

3 aaaa

Simplify the Expression.811

9 rr

Find the LCD for 11 and 8. Find the LCD for 11 and 8. LCD = 88

Rewrite equivalent fractions using the LCD. Rewrite equivalent fractions using the LCD.

88

?

11

9r

88

11

88

72 rr

88

72

811

89 rr

88

83

88

1172 rrr

88

?

8r

88

11

118

11 rr

Homework Text p. 234, #12-50 evensText p. 234, #12-50 evens

HomeworkHomeworkPunchline worksheets #72 & #73Punchline worksheets #72 & #73

““Why Does the President Put Why Does the President Put Vegetables in His Blender?”Vegetables in His Blender?”

HE IS HOPING FOR WHIRLED PEASHE IS HOPING FOR WHIRLED PEAS

““How Could Goldilocks and The BigHow Could Goldilocks and The BigBad Wolf Be in the Same House?”Bad Wolf Be in the Same House?”

IT WAS A TWO STORY HOUSEIT WAS A TWO STORY HOUSE

Homework

2) -86 / 1 4) -109 / 12 6) -555 / 1 8) 67 / 14 10) -0.27 12) 8.15 14) -7.25 16) -2.225 18) 1.5 20) -10.194 22) 1/25 24) 14 1/200 26) 16/99 28) 3 23/30

2) -4/5 4) 1 3/43 6) 1/25 8) -21/40 10) -1 1/7 12) -11 5/9 14) 4 3/5 16) -5 5/8 18) 5x / 7 20) –x 22) 1 / 12x 24) 3 / x

2) 26 / 63 4) -17 / 36 6) -1 23/60 8) 19 / 35 10) 1 2/15 12) -8/15 14) 1 19/45 16) 23/40 18) -2 31/50 20) -10/33 22) -5 41/48 24) 2 23/48 26) 43x / 24 28) -36x / 35 30) 11/35

Practice worksheet 5.1 B evens

Practice worksheet 5.2 B evens

Practice worksheet 5.3 B evens