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Subtract 12/45 from 28/20

1st number: 1 8/20, 2nd number: 12/45

28/20 - 12/45 is 17/15.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 45 is 180

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 20 × 9 = 180,
    28/20 = 28 × 9/20 × 9 = 252/180
  3. Likewise, for the 2nd fraction, since 45 × 4 = 180,
    12/45 = 12 × 4/45 × 4 = 48/180
  4. Subtract the two like fractions:
    252/180 - 48/180 = 252 - 48/180 = 204/180
  5. After reducing the fraction, the answer is 17/15
  6. In mixed form: 12/15

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