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Subtract 21/9 from 27/15

1st number: 1 12/15, 2nd number: 2 3/9

27/15 - 21/9 is -8/15.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 9 is 45

    Next, find the equivalent fraction of both fractional numbers with denominator 45
  2. For the 1st fraction, since 15 × 3 = 45,
    27/15 = 27 × 3/15 × 3 = 81/45
  3. Likewise, for the 2nd fraction, since 9 × 5 = 45,
    21/9 = 21 × 5/9 × 5 = 105/45
  4. Subtract the two like fractions:
    81/45 - 105/45 = 81 - 105/45 = -24/45
  5. After reducing the fraction, the answer is -8/15

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