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Subtract 9/20 from 4/5

4/5 - 9/20 is 7/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 20 is 20

    Next, find the equivalent fraction of both fractional numbers with denominator 20
  2. For the 1st fraction, since 5 × 4 = 20,
    4/5 = 4 × 4/5 × 4 = 16/20
  3. Likewise, for the 2nd fraction, since 20 × 1 = 20,
    9/20 = 9 × 1/20 × 1 = 9/20
  4. Subtract the two like fractions:
    16/20 - 9/20 = 16 - 9/20 = 7/20

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