Fractions addition and subtraction trick

Forget finding common denominators when adding dissimilar fractions - this way is much faster and easier.

Time: 8:02

 

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Octagram Star

Octagram Star

Arrange the sixteen numbers on the octagram so that the numbers in each line add up to the same total. So far this activity has been accessed 12 times and 2 people have earned a Transum Trophy for completing it.

Teacher: Click the play button in the centre of the video screen above. In the bottom right corner of the video (when you cursor moves over the playing video) is a broken square button which opens full-screen mode.

Fractions addition and subtraction trick

Forget finding common denominators when adding dissimilar fractions - this way is much faster and easier.

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