Explain how to find the least common denominator to add/subtract fractions with unlike denominators
You will do this for EACH fraction
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Do the fractions have the same denominator?
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NO
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Find the factors for each denominator (use a multiplication chart if necessary).
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Circle the smallest number they both have in common.
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Is the denominator the same as the common number circled?
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YES
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Leave the fraction alone.
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YES
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NO
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add or subtract the numerators and keep the same denominator
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Create an equivalent fraction where the denominator is the same as the common number circled.
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NO
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Check the 2nd fraction, is the denominator the same as the common number circled?
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YES
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Figure out what number can be multiplied by the denominator so it is equal to the common number circled.
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Leave the fraction alone.
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Multiply the numerator and the denominator by the same number
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This is your new equivalent fraction.
Rewrite your new equation and solve.
Make sure you did this for BOTH fractions.
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Finding Least Common Denominator
