Equivalent Fractions Raising and Reducing
Equivalent Fractions Raising and Reducing. Pizza Remaining 3/4 6/8 9/12.
Dec 17, 2015
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Equivalent Fractions
Raising and Reducing
Pizza Remaining
3/4
6/8 9/12
Multiply by 1
5 x 1 =
235 x 1 =
2/3 x 1 =
a x 1 =
5
235
2/3
a
What is 1?
12
2 1
5
5
1453
453 1
a
a
Raising Fractions
14
3x
3 2 64 2 8
x
3 3 94 3 12
x
Raising Fractions
To raise fractions, increase the denominator.
Multiply numerator and denominator (top and bottom) of the fraction by the same number.
This is the same thing as multiplying by 1.
Raising Fractions
Multiply numerator and denominator (top and bottom) of the fraction by the same number.
This is the same thing as multiplying by 1.
15
6
3
3
5
2
Raising Fractions
Raise 3/8 to 56ths.
Multiply numerator and denominator (top and bottom) of the fraction by the same number.
568
3
Raising Fractions
Raise 3/8 to 56ths.
Multiply numerator and denominator (top and bottom) of the fraction by the same number.
3 7 218 7 56
Reducing Fractions
Opposite of raising.
Make the denominator smaller.
Divide numerator and denominator by the same number.
21 7 356 7 8
Reducing Fractions
Might take more than one step.
More than one way.
Divide numerator and denominator by the same number.
40 2 20 2 10 2 556 2 28 2 14 2 7
Reducing Fractions
Divide numerator and denominator by the same number.
4477
Reducing Fractions
Divide numerator and denominator by the same number.
44 11 477 11 7
Proper and Improper
An improper fraction has a numerator as large or larger than the denominator.
A proper fraction has a numerator smaller than the denominator.
5
12,5
5,1
2,5
8
8 2 5 12, , ,
9 35 10 51
Mixed vs. Improper
A mixed number is a whole number and a fraction part.
A mixed number can be written as an improper fraction.
5
17
5
23
Work this on paper.
We have 5 full crates of apples and one crate with only 7 apples. The full crates each contain 30 apples.
How many apples altogether?
Mixed to Improper.
Multiply the 5 crates times the 30 in each crate and add the 7 left over.
To change a mixed number to improper, multiply the whole number by the denominator and add the numerator. Keep the denominator the same.
30
157
30
730*5
N DxW NW
D D
Mixed to improper
Try some.
8
37
2
15
7
23
Mixed to improper
Try some. 2 2337 7
1 1152 2
3 5978 8
Try this on paper.
We have 135 pencils and boxes that hold 12 each.
How many full boxes? How many loose pencils?
How did you get your answer?
Try this on paper.
We have 135 pencils and boxes that hold 12 each.
How many full boxes? 11 How many loose pencils? 3
How did you get your answer?
Divided 135 by 12. The remainder was the left over.
135/12 = 11 3/12
Improper to Mixed
Divide.
Try these.
3
51
215
3
41
Answers
23
12
4113
3
15 72
5117
3
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