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Subtract 21/8 from 15/9

1st number: 1 6/9, 2nd number: 2 5/8

15/9 - 21/8 is -23/24.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 9 and 8 is 72

    Next, find the equivalent fraction of both fractional numbers with denominator 72
  2. For the 1st fraction, since 9 × 8 = 72,
    15/9 = 15 × 8/9 × 8 = 120/72
  3. Likewise, for the 2nd fraction, since 8 × 9 = 72,
    21/8 = 21 × 9/8 × 9 = 189/72
  4. Subtract the two like fractions:
    120/72 - 189/72 = 120 - 189/72 = -69/72
  5. After reducing the fraction, the answer is -23/24

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