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Subtract 10/12 from 21/28

21/28 - 10/12 is -1/12.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 12 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 28 × 3 = 84,
    21/28 = 21 × 3/28 × 3 = 63/84
  3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
    10/12 = 10 × 7/12 × 7 = 70/84
  4. Subtract the two like fractions:
    63/84 - 70/84 = 63 - 70/84 = -7/84
  5. After reducing the fraction, the answer is -1/12

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