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Subtract 81/12 from 2/21

1st number: 2/21, 2nd number: 6 9/12

2/21 - 81/12 is -559/84.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 12 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 21 × 4 = 84,
    2/21 = 2 × 4/21 × 4 = 8/84
  3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
    81/12 = 81 × 7/12 × 7 = 567/84
  4. Subtract the two like fractions:
    8/84 - 567/84 = 8 - 567/84 = -559/84

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