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Subtract 12/28 from 5/21

5/21 - 12/28 is -4/21.

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,
    5/21 = 5 × 4/21 × 4 = 20/84
  3. Likewise, for the 2nd fraction, since 28 × 3 = 84,
    12/28 = 12 × 3/28 × 3 = 36/84
  4. Subtract the two like fractions:
    20/84 - 36/84 = 20 - 36/84 = -16/84
  5. After reducing the fraction, the answer is -4/21

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