Add and subtract fractions unlike denominators

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What is a fraction?

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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?

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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 the fractions, and then add the numerators.

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What is the least common denominator (LCD)?

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The least common denominator (LCD) is the smallest multiple that two or more denominators share. It is used to add or subtract fractions.

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How do you subtract fractions with unlike denominators?

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To subtract fractions with unlike denominators, find a common denominator, convert the fractions, and then subtract the numerators.

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The first step is to find the least common denominator (LCD) of 5 and 4, which is 20.

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The first step is to find the least common denominator (LCD) of 9 and 6, which is 18.

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The first step is to find the least common denominator (LCD) of 7 and 5, which is 35.