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Subtract 45/12 from 9/42

1st number: 9/42, 2nd number: 3 9/12

9/42 - 45/12 is -99/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 12 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 42 × 2 = 84,
    9/42 = 9 × 2/42 × 2 = 18/84
  3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
    45/12 = 45 × 7/12 × 7 = 315/84
  4. Subtract the two like fractions:
    18/84 - 315/84 = 18 - 315/84 = -297/84
  5. After reducing the fraction, the answer is -99/28

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