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Subtract 21/6 from 18/20

1st number: 18/20, 2nd number: 3 3/6

18/20 - 21/6 is -13/5.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 6 is 60

    Next, find the equivalent fraction of both fractional numbers with denominator 60
  2. For the 1st fraction, since 20 × 3 = 60,
    18/20 = 18 × 3/20 × 3 = 54/60
  3. Likewise, for the 2nd fraction, since 6 × 10 = 60,
    21/6 = 21 × 10/6 × 10 = 210/60
  4. Subtract the two like fractions:
    54/60 - 210/60 = 54 - 210/60 = -156/60
  5. After reducing the fraction, the answer is -13/5

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