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Subtract 7/9 from 18/42

18/42 - 7/9 is -22/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 9 is 126
  2. For the 1st fraction, since 42 × 3 = 126,
    18/42 = 18 × 3/42 × 3 = 54/126
  3. Likewise, for the 2nd fraction, since 9 × 14 = 126,
    7/9 = 7 × 14/9 × 14 = 98/126
  4. Subtract the two fractions:
    54/126 - 98/126 = 54 - 98/126 = -44/126
  5. After reducing the fraction, the answer is -22/63

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