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Subtract 72/18 from 1/20

1st number: 1/20, 2nd number: 4 0/18

1/20 - 72/18 is -79/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 18 is 180

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 20 × 9 = 180,
    1/20 = 1 × 9/20 × 9 = 9/180
  3. Likewise, for the 2nd fraction, since 18 × 10 = 180,
    72/18 = 72 × 10/18 × 10 = 720/180
  4. Subtract the two like fractions:
    9/180 - 720/180 = 9 - 720/180 = -711/180
  5. After reducing the fraction, the answer is -79/20

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