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Subtract 9/40 from 1/20

1/20 - 9/40 is -7/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 40 is 40

    Next, find the equivalent fraction of both fractional numbers with denominator 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 40 × 1 = 40,
    9/40 = 9 × 1/40 × 1 = 9/40
  4. Subtract the two like fractions:
    2/40 - 9/40 = 2 - 9/40 = -7/40

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