Equivalent fractions powerpoint ppt
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Equivalent Fractions
Mrs. Emeott's 4th Grade Class
Clare Primary School
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Table of Contents:
What is an Equivalent Fraction? Why use Equivalent Fractions?
How to find Equivalent Fractions?
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Equivalent Fractions
Equivalent means “Equal”
The numerator (top number) is differentThe denominator (bottom number) is different.
Although they are different numbers they are the same amount.
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Fraction Models: kmott.wikispaces.com
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Fraction Models:
So 2/3 is the same as 8/12.
Image source:visualfractions.com
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One Whole
One Whole
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Cut Them in Half
1 The
Numerator
2 The
Denominator (How many pieces its cut into)
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Cut them in Half Again
I still show the same thing, but now I also show a new fraction that is equal (equivalent)
1 And Also 2
2 4
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They are the Same!
One Half is equivalent to 2 quarters.
1 22 = 4
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Why use Equivalent Fractions?
Equivalent Fractions make large numbers easier to deal with.
Smaller numbers are simple.
50 5 1100 = 10 = 2
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To Find Equivalent Fractions:
Multiply the numerator and denominator by the same number.
1 4 4
5 x 4 = 20
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To Find Equivalent Fractions
Multiply the numerator and denominator by the same number.
15 Divide by 3 Both 15 and 45 have 3
as a common factor!
45 Divide by 3
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Find Equivalent Fractions
15 Divide by 3 5
45 = Divide by 3 15
Start thinking ahead. Can we make the 5/15 smaller? What number do 5 and 15
have in common?
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Now you try it!
Look at the top picture. It is cut into fourths.
The bottom picture is cut into eighths. How many eighths would be equal to the the ¾ that are shaded red?
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http://commons.wikimedia.org/wiki/File:Equal_Fractions_123.svg
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Did you get the right answer?
6, That's Right!
6/8 = 3/4
6 divided by 2=3
8 divided by 2= 4