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Subtract 56/15 from 3/21

1st number: 3/21, 2nd number: 3 11/15

3/21 - 56/15 is -377/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 15 is 105

    Next, find the equivalent fraction of both fractional numbers with denominator 105
  2. For the 1st fraction, since 21 × 5 = 105,
    3/21 = 3 × 5/21 × 5 = 15/105
  3. Likewise, for the 2nd fraction, since 15 × 7 = 105,
    56/15 = 56 × 7/15 × 7 = 392/105
  4. Subtract the two like fractions:
    15/105 - 392/105 = 15 - 392/105 = -377/105

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