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Subtract 12/18 from 4/7

4/7 - 12/18 is -2/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 18 is 126

    Next, find the equivalent fraction of both fractional numbers with denominator 126
  2. For the 1st fraction, since 7 × 18 = 126,
    4/7 = 4 × 18/7 × 18 = 72/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    12/18 = 12 × 7/18 × 7 = 84/126
  4. Subtract the two like fractions:
    72/126 - 84/126 = 72 - 84/126 = -12/126
  5. After reducing the fraction, the answer is -2/21

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