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Subtract 21/80 from 21/15

1st number: 1 6/15, 2nd number: 21/80

21/15 - 21/80 is 91/80.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 80 is 240

    Next, find the equivalent fraction of both fractional numbers with denominator 240
  2. For the 1st fraction, since 15 × 16 = 240,
    21/15 = 21 × 16/15 × 16 = 336/240
  3. Likewise, for the 2nd fraction, since 80 × 3 = 240,
    21/80 = 21 × 3/80 × 3 = 63/240
  4. Subtract the two like fractions:
    336/240 - 63/240 = 336 - 63/240 = 273/240
  5. After reducing the fraction, the answer is 91/80
  6. In mixed form: 111/80

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