Could you use a little help figuring out how to add and subtract fractions containing different denominators? Watch this free video lesson. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this free math tutorial, you'll learn how to sum and subtract fractions with different denominators in basic arithmetic.

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