Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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Adding/Subtracting Fractions- Unlike Denominators - Problem 1

Alissa Fong
Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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If we want to add or subtract fractions, we must first re-write the fractions in equivalent forms that have the same bottom, or denominator. We look for the least common multiple of the denominators. You'll get the correct answer in the end, even if you don't use the least common multiple- but you'll have more reducing to do later. Once they have common denominators, add the tops only and leave the bottoms unchanged. Look to reduce at the very end if necessary.

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