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Subtract 3/20 from 1/7

1/7 - 3/20 is -1/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 20 is 140

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 7 × 20 = 140,
    1/7 = 1 × 20/7 × 20 = 20/140
  3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
    3/20 = 3 × 7/20 × 7 = 21/140
  4. Subtract the two like fractions:
    20/140 - 21/140 = 20 - 21/140 = -1/140

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