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Subtract 21/80 from 28/15

1st number: 1 13/15, 2nd number: 21/80

28/15 - 21/80 is 77/48.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 80 is 240
  2. For the 1st fraction, since 15 × 16 = 240,
    28/15 = 28 × 16/15 × 16 = 448/240
  3. Likewise, for the 2nd fraction, since 80 × 3 = 240,
    21/80 = 21 × 3/80 × 3 = 63/240
  4. Subtract the two fractions:
    448/240 - 63/240 = 448 - 63/240 = 385/240
  5. After reducing the fraction, the answer is 77/48
  6. In mixed form: 129/48

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