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Decomposing Fractions

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Nichole Deno

on 11 February 2013

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Transcript of Decomposing Fractions

Joining and Separating Fractions What does it mean to join or separate? http://learnzillion.com/lessons/1421-add-fractions-by-joining-parts

Let's Try this problem out! A cook has a pound of butter that has been cut into 8 equal parts. Create this on your sheet of paper.
Two parts will be used for making pancakes, and 1 part will be used for baking cookies. Illustrate these two amounts with a visual model and write an addition equation for the total amount of butter that will be used for the pancakes and cookies. Let's practice separating! Beginning with an 8/8 bar, cross off the parts of the whole bar to show 2/8 pound and 1/8 pound of butter being used (taken away). Write a subtraction equation to show the remaining amount of butter.


Create a model of this!
A different way to think about fractions. Let's Watch! A New Practice Problem A strip of ribbon is cut into 6 equal parts. If 2/6 of the strip is used for Doll A and 3/6
of the strip is used for Doll B, what fraction of the ribbon has been used? (2/6 + 3/6 =
5/6) What fraction of the ribbon is left? (6/6 - 2/6 - 3/6 = 1/6; or 1 - 2/6 - 3/6 = 1/6) Draw a fraction model! Another Practice Problem A pizza is cut into 8 equal parts. If JJ eats 3/8 of the pizza and BB eats 4/8 of the
pizza, how much of the pizza has been eaten? (3/8 + 4/8 = 7/8) How much of the
pizza is left? (8/8 - 3/8 - 4/8 = 1/8; or 1 - 3/8 - 4/8 = 1/8) Decomposing Fractions A construction company needs to pave a road that is 9/12 of a mile long.
Draw a picture of this on your paper.




If they can pave 3/12 of a mile each day, how many days will it take them to pave
9/12 of a mile? (3 days) Write an equation for these fractional amounts.

Let's practice drawing this! Decomposing Fractions Video http://learnzillion.com/lessons/1423-decompose-fractions After watching this video, think of other ways to decompose the fraction 12/12. Now it is Your Turn To Try! Rally-Coach with your partner the worksheet being placed on your desk!
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