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Subtract 18/21 from 2/18

2/18 - 18/21 is -47/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 21 is 126

    Next, find the equivalent fraction of both fractional numbers with denominator 126
  2. For the 1st fraction, since 18 × 7 = 126,
    2/18 = 2 × 7/18 × 7 = 14/126
  3. Likewise, for the 2nd fraction, since 21 × 6 = 126,
    18/21 = 18 × 6/21 × 6 = 108/126
  4. Subtract the two like fractions:
    14/126 - 108/126 = 14 - 108/126 = -94/126
  5. After reducing the fraction, the answer is -47/63

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