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Subtract 9/12 from 15/21

15/21 - 9/12 is -1/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 12 is 84
  2. For the 1st fraction, since 21 × 4 = 84,
    15/21 = 15 × 4/21 × 4 = 60/84
  3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
    9/12 = 9 × 7/12 × 7 = 63/84
  4. Subtract the two fractions:
    60/84 - 63/84 = 60 - 63/84 = -3/84
  5. After reducing the fraction, the answer is -1/28

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