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Subtract 21/15 from 12/16

1st number: 12/16, 2nd number: 1 6/15

12/16 - 21/15 is -13/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 16 and 15 is 240

    Next, find the equivalent fraction of both fractional numbers with denominator 240
  2. For the 1st fraction, since 16 × 15 = 240,
    12/16 = 12 × 15/16 × 15 = 180/240
  3. Likewise, for the 2nd fraction, since 15 × 16 = 240,
    21/15 = 21 × 16/15 × 16 = 336/240
  4. Subtract the two like fractions:
    180/240 - 336/240 = 180 - 336/240 = -156/240
  5. After reducing the fraction, the answer is -13/20

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