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Subtract 20/21 from 15/12

1st number: 1 3/12, 2nd number: 20/21

15/12 - 20/21 is 25/84.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 21 is 84
  2. For the 1st fraction, since 12 × 7 = 84,
    15/12 = 15 × 7/12 × 7 = 105/84
  3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
    20/21 = 20 × 4/21 × 4 = 80/84
  4. Subtract the two fractions:
    105/84 - 80/84 = 105 - 80/84 = 25/84

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