Decompose a fraction into a sum of fractions with the same denominator in more than one way, recording each decomposition by an equation. Justify decompositions, e.g., by using a visual fraction model. Examples: 3/8 = 1/8 + 1/8 + 1/8 ; 3/8 = 1/8 + 2/8 ; 2 1/8 = 1 + 1 + 1/8 = 8/8 + 8/8 + 1/8.

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Category Videos
Not Right For WatchKnowLearn
Ages: 9 - 15
Adding & Subtracting Fractions
From YouTube, produced by LearnBetterNow.com
Instructor uses a whiteboard to demonstrate how to add and subtract fractions. In the first part of the video they add with like denominators, then they reduce the fraction. Then they add with unlike denominators, first they find the lowest common mu... [more]
Found by Barb in 4.NF.B.3b
August 4, 2009 at 07:28 PM
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Not Right For WatchKnowLearn
Ages: 9 - 13
Number Line Bars - Fractions - Virtual Manipulative
From usu.edu, produced by Utah State University
This is a very versatile tool that can be used to illustrate a variety of number operations. The background of the workspace is marked by light gray grid lines. The default step-size of the grid lines is 1/10 unit. There are more instructions on the ... [more]
May 9, 2010 at 12:35 PM
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