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Subtract 15/4 from 56/21

1st number: 2 14/21, 2nd number: 3 3/4

56/21 - 15/4 is -13/12.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 4 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 21 × 4 = 84,
    56/21 = 56 × 4/21 × 4 = 224/84
  3. Likewise, for the 2nd fraction, since 4 × 21 = 84,
    15/4 = 15 × 21/4 × 21 = 315/84
  4. Subtract the two like fractions:
    224/84 - 315/84 = 224 - 315/84 = -91/84
  5. After reducing the fraction, the answer is -13/12

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