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