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Subtract 21/15 from 3/4

1st number: 3/4, 2nd number: 1 6/15

3/4 - 21/15 is -13/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 15 is 60

    Next, find the equivalent fraction of both fractional numbers with denominator 60
  2. For the 1st fraction, since 4 × 15 = 60,
    3/4 = 3 × 15/4 × 15 = 45/60
  3. Likewise, for the 2nd fraction, since 15 × 4 = 60,
    21/15 = 21 × 4/15 × 4 = 84/60
  4. Subtract the two like fractions:
    45/60 - 84/60 = 45 - 84/60 = -39/60
  5. After reducing the fraction, the answer is -13/20

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