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Subtract 21/27 from 15/36

15/36 - 21/27 is -13/36.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 36 and 27 is 108

    Next, find the equivalent fraction of both fractional numbers with denominator 108
  2. For the 1st fraction, since 36 × 3 = 108,
    15/36 = 15 × 3/36 × 3 = 45/108
  3. Likewise, for the 2nd fraction, since 27 × 4 = 108,
    21/27 = 21 × 4/27 × 4 = 84/108
  4. Subtract the two like fractions:
    45/108 - 84/108 = 45 - 84/108 = -39/108
  5. After reducing the fraction, the answer is -13/36

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