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Subtract 9/10 from 3/12

3/12 - 9/10 is -13/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 10 is 60
  2. For the 1st fraction, since 12 × 5 = 60,
    3/12 = 3 × 5/12 × 5 = 15/60
  3. Likewise, for the 2nd fraction, since 10 × 6 = 60,
    9/10 = 9 × 6/10 × 6 = 54/60
  4. Subtract the two fractions:
    15/60 - 54/60 = 15 - 54/60 = -39/60
  5. After reducing the fraction, the answer is -13/20

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