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Contributor: Dennis Denoia. Lesson ID: 10549
Is the common denominator of your trouble with adding fractions the long way of finding common denominators? Instead of writing out multiples, watch and learn Mr. D's uncommon technique using primes!
Mr. D uses his uncommon technique to make it easy!
Watch Mr. D show you how to make a common denominator without having to list out all the multiples:
Continue on to the Got It? section for some helpful practice!
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