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Subtract 3/8 from 1/20

1/20 - 3/8 is -13/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 8 is 40
  2. For the 1st fraction, since 20 × 2 = 40,
    1/20 = 1 × 2/20 × 2 = 2/40
  3. Likewise, for the 2nd fraction, since 8 × 5 = 40,
    3/8 = 3 × 5/8 × 5 = 15/40
  4. Subtract the two fractions:
    2/40 - 15/40 = 2 - 15/40 = -13/40

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