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Subtract 8/18 from 1/21

1/21 - 8/18 is -25/63.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 126
  2. For the 1st fraction, since 21 × 6 = 126,
    1/21 = 1 × 6/21 × 6 = 6/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    8/18 = 8 × 7/18 × 7 = 56/126
  4. Subtract the two like fractions:
    6/126 - 56/126 = 6 - 56/126 = -50/126
  5. After reducing the fraction, the answer is -25/63

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