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Subtract 15/4 from 12/42

1st number: 12/42, 2nd number: 3 3/4

12/42 - 15/4 is -97/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 4 is 84
  2. For the 1st fraction, since 42 × 2 = 84,
    12/42 = 12 × 2/42 × 2 = 24/84
  3. Likewise, for the 2nd fraction, since 4 × 21 = 84,
    15/4 = 15 × 21/4 × 21 = 315/84
  4. Subtract the two fractions:
    24/84 - 315/84 = 24 - 315/84 = -291/84
  5. After reducing the fraction, the answer is -97/28

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