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Subtract 45/42 from 12/15

1st number: 12/15, 2nd number: 1 3/42

12/15 - 45/42 is -19/70.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 42 is 210
  2. For the 1st fraction, since 15 × 14 = 210,
    12/15 = 12 × 14/15 × 14 = 168/210
  3. Likewise, for the 2nd fraction, since 42 × 5 = 210,
    45/42 = 45 × 5/42 × 5 = 225/210
  4. Subtract the two fractions:
    168/210 - 225/210 = 168 - 225/210 = -57/210
  5. After reducing the fraction, the answer is -19/70

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