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Subtract 12/15 from 21/8

1st number: 2 5/8, 2nd number: 12/15

21/8 - 12/15 is 73/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 8 and 15 is 120

    Next, find the equivalent fraction of both fractional numbers with denominator 120
  2. For the 1st fraction, since 8 × 15 = 120,
    21/8 = 21 × 15/8 × 15 = 315/120
  3. Likewise, for the 2nd fraction, since 15 × 8 = 120,
    12/15 = 12 × 8/15 × 8 = 96/120
  4. Subtract the two like fractions:
    315/120 - 96/120 = 315 - 96/120 = 219/120
  5. After reducing the fraction, the answer is 73/40
  6. In mixed form: 133/40

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