Adding Fractions with Unlike Denominators (Probe 5)

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What is a fraction?

Back

A fraction represents a part of a whole and consists of a numerator (top number) and a denominator (bottom number).

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What does it mean to have unlike denominators in fractions?

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How do you add fractions with unlike denominators?

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To add fractions with unlike denominators, first find a common denominator, convert each fraction to an equivalent fraction with that denominator, and then add the numerators.

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What is the least common multiple (LCM)?

Back

The least common multiple (LCM) is the smallest multiple that two or more numbers share. It is used to find a common denominator for adding fractions.

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Find the LCM of 7 and 10.

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The LCM of 7 and 10 is 70.

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Find the LCM of 6 and 11, which is 66.

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