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Subtract 3/28 from 10/21

10/21 - 3/28 is 31/84.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 28 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 21 × 4 = 84,
    10/21 = 10 × 4/21 × 4 = 40/84
  3. Likewise, for the 2nd fraction, since 28 × 3 = 84,
    3/28 = 3 × 3/28 × 3 = 9/84
  4. Subtract the two like fractions:
    40/84 - 9/84 = 40 - 9/84 = 31/84

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