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Subtract 3/21 from 7/8

7/8 - 3/21 is 41/56.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 8 and 21 is 168

    Next, find the equivalent fraction of both fractional numbers with denominator 168
  2. For the 1st fraction, since 8 × 21 = 168,
    7/8 = 7 × 21/8 × 21 = 147/168
  3. Likewise, for the 2nd fraction, since 21 × 8 = 168,
    3/21 = 3 × 8/21 × 8 = 24/168
  4. Subtract the two like fractions:
    147/168 - 24/168 = 147 - 24/168 = 123/168
  5. After reducing the fraction, the answer is 41/56

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