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Subtract 80/7 from 21/12

1st number: 1 9/12, 2nd number: 11 3/7

21/12 - 80/7 is -271/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 7 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 12 × 7 = 84,
    21/12 = 21 × 7/12 × 7 = 147/84
  3. Likewise, for the 2nd fraction, since 7 × 12 = 84,
    80/7 = 80 × 12/7 × 12 = 960/84
  4. Subtract the two like fractions:
    147/84 - 960/84 = 147 - 960/84 = -813/84
  5. After reducing the fraction, the answer is -271/28

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