Understand addition and subtraction of fractions as joining and separating parts referring to the same whole.
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Not Right For WatchKnowLearn
Ages: 8  14
6332 Views:

When Diffy opens, there are four black numbers placed at the corners of a black square. Your first goal is to fill in the four blanks in the blue circles in the middle of each side of the black square.
Start with any side of the black square and cli...ck in the blank in the blue circle on that side and type in the difference of the black numbers on that side (the larger black number less the smaller one). So if the black numbers on the top side of the black square were 7 and 12, we would type 5 (= 12 – 7) in the blue circle between the 7 and the 12.
Note: There are more directions on the right side.
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May 9, 2010 at 11:11 AM


Not Right For WatchKnowLearn
Ages: 9  15
3181 Views:

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.
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August 4, 2009 at 07:28 PM


Not Right For WatchKnowLearn
Ages: 10  15
1930 Views:

Adding and Subtracting Fractions / Mixed Numbers: Example 3. In this video, the instructor shows how to add / subtract fractions that have different denominators at the beginning. (04:02)
February 20, 2012 at 02:26 PM


Not Right For WatchKnowLearn
Ages: 8  14
3290 Views:

The four rules  adding, subtracting, division and multiplication  with fractions. This is an excellent slideshow. The teacher or the student can control how fast the presentation should be. The presenter gives the rule in one slide and the student ...can practice the rule in the next slide.
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July 21, 2011 at 01:29 PM


Not Right For WatchKnowLearn
Ages: 8  13
3887 Views:

This is a slideshow in which the instructor shows adding, subtracting, multiplying, and dividing fractions step by step. There is no sound. (24 slides)
July 21, 2011 at 01:40 PM


Not Right For WatchKnowLearn
Ages: 10  15
1018 Views:

The instructor uses an electronic sketchpad to demonstrate the process to add or subtract fractions and mixed numbers. It includes four examples.
January 23, 2010 at 04:01 PM


Not Right For WatchKnowLearn
Ages: 9  13
2246 Views:

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 stepsize of the grid lines is 1/10 unit. There are more instructions on the ...right side of the Java applet.
Step size
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May 9, 2010 at 12:35 PM
