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Subtract 21/9 from 15/12

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

15/12 - 21/9 is -13/12.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 9 is 36
  2. For the 1st fraction, since 12 × 3 = 36,
    15/12 = 15 × 3/12 × 3 = 45/36
  3. Likewise, for the 2nd fraction, since 9 × 4 = 36,
    21/9 = 21 × 4/9 × 4 = 84/36
  4. Subtract the two fractions:
    45/36 - 84/36 = 45 - 84/36 = -39/36
  5. After reducing the fraction, the answer is -13/12

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