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Subtract 21/10 from 12/15

1st number: 12/15, 2nd number: 2 1/10

12/15 - 21/10 is -13/10.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 10 is 30
  2. For the 1st fraction, since 15 × 2 = 30,
    12/15 = 12 × 2/15 × 2 = 24/30
  3. Likewise, for the 2nd fraction, since 10 × 3 = 30,
    21/10 = 21 × 3/10 × 3 = 63/30
  4. Subtract the two fractions:
    24/30 - 63/30 = 24 - 63/30 = -39/30
  5. After reducing the fraction, the answer is -13/10

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