Add and Subtract Unlike Fractions

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What is an unlike fraction?

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Unlike fractions are fractions that have different denominators.

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How do you add unlike fractions?

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

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What is a common denominator?

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A common denominator is a shared multiple of the denominators of two or more fractions.

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What does it mean to simplify a fraction?

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To simplify a fraction means to reduce it to its lowest terms, where the numerator and denominator have no common factors other than 1.

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Which of the following is NOT a multiple of 7: 42, 49, 54, 63?

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54 is not a multiple of 7.