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Subtract 3/20 from 1/8

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

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 8 and 20 is 40
  2. For the 1st fraction, since 8 × 5 = 40,
    1/8 = 1 × 5/8 × 5 = 5/40
  3. Likewise, for the 2nd fraction, since 20 × 2 = 40,
    3/20 = 3 × 2/20 × 2 = 6/40
  4. Subtract the two fractions:
    5/40 - 6/40 = 5 - 6/40 = -1/40

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