do now 3/11/11 take out hw from last night. take out hw from last night. brain game p. 224. brain...
TRANSCRIPT
Do Now 3/11/11Do Now 3/11/11 Take out HW from last night.Take out HW from last night.
Brain Game p. 224.Brain Game p. 224.
Copy HW in your planner.Copy HW in your planner. Text page 240, #8-20 allText page 240, #8-20 all
Did you hand in the POTW #7?Did you hand in the POTW #7?
HomeworkHomeworkBrain game p. 224Brain game p. 224
4/15, 73/200, 4/15, 73/200, 11/30, 5/12, 19/40, 11/30, 5/12, 19/40, 17/25, 87/100, 7/817/25, 87/100, 7/8
CHARCOALCHARCOAL
Text p. 224Text p. 224
ObjectiveObjective
SWBAT multiply fractions and mixed SWBAT multiply fractions and mixed numbers.numbers.
Section 5.4, “Multiplying Section 5.4, “Multiplying Fractions” Fractions”
Multiplying FractionsMultiplying Fractions
To multiply fractions:To multiply fractions:
1. Rewrite fractions as improper fractions 1. Rewrite fractions as improper fractions (when necessary)(when necessary)
2. Multiply the numerators and 2. Multiply the numerators and denominators.denominators.
3. Simplify if necessary.3. Simplify if necessary.
bd
ac
d
c
b
a
35
12
7
4
5
3
21
4
10
7
21
4
10
7
35
)2(1
2110
)4(7
MultiplyMultiply
Assign negative sign to the numeratorAssign negative sign to the numerator
Divide (cancel) common factorsDivide (cancel) common factors
MultiplyMultiply
11
3355
-2-2
15
2
Fraction times FractionFraction times Fraction
5
13
4
32
5
16
4
11
51
)4(11
54
)16(11
MultiplyMultiply
Rewrite as improper fractions and assign Rewrite as improper fractions and assign negative to numerator.negative to numerator.
Divide (cancel) common factorsDivide (cancel) common factors
MultiplyMultiply11
44
5
44
5
48
SimplifySimplify
Mixed Number times Mixed Number times Mixed NumberMixed Number
11
3210
1
10
111
)25(10
111
)25(10
MultiplyMultiply
Rewrite as improper fractions and assign Rewrite as improper fractions and assign negative to numerator.negative to numerator.
Divide (cancel) common Divide (cancel) common factors if possiblefactors if possible
MultiplyMultiply
11
250
11
822
SimplifySimplify
Rewrite a Rewrite a whole number whole number with a with a denominator denominator of 1.of 1.
11
25
Whole Number times Whole Number times FractionFraction
Try It Out!!Try It Out!!Solve Solve
32
5
88
)2(5
5
35
5
28
15
)14(2
3
21
8
14
91
9
11
33
8
76
8
55
18
)5(11
8
2
8
5
4
312
9
51
5
33
3
5
8
33
9
14
5
18
11
-2-2
44
-1-1
11
-3-3
11
1111
4
3
1
12
GeometryGeometry
Find the Find the area of the area of the figure.figure.
7
11
21
173
21
80
3
10
7
83
13
7
11
3
13
units²
Word ProblemsWord Problems
Who ran farther Sally Jo or Sally Sue? Who ran farther Sally Jo or Sally Sue?
Sally Jo ran 4 ½ times around a ½ mi. track.Sally Jo ran 4 ½ times around a ½ mi. track.Sally Sue ran 3 ¼ times around a 5/6mi. trackSally Sue ran 3 ¼ times around a 5/6mi. track
6
5
4
13
2
1
2
14
2
1
2
9
6
5
4
13
4
12
4
9
24
172
24
65
24
62
4
12
Sally SueSally Sueran farther!!ran farther!!
Homework Homework
Text page 240, #8-20 allText page 240, #8-20 all