Friday, April 18, 2014

FREE MATH LESSON - “Fraction Addition Poster (Common Core)”

by Scaffolded Math and Science
4th - 7th Grade

This poster demonstrates the new Common Core way of adding fractions - see ya LCD! "a/b + c/d = (ad + bc)/bd" The "crisscross" method to add (and subtract) fractions is a lot less cumbersome than finding the lowest common denominator. Thanks Common Core! In this download you will receive the poster seen in the thumbnail as well as one without a border. On the 3rd page of the download is a set of directions to enlarge the file into a classroom-sized poster for free (sorry, Staples!) from any printer.

For a complete lesson with practice and answer key on adding and subtracting fractions:

More Fraction stuff from Scaffolded Math and Science

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