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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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...ltiple, then convert the fraction, then add them. Then they move on to subtraction with like denominators. Then they give you problems to practice on. Video is good quality and good for all students as a review or initial learning of the topic.[more]

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 ...right side of the Java applet.
Step size[more]

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