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Subtract 75/20 from 20/28

1st number: 20/28, 2nd number: 3 15/20

20/28 - 75/20 is -85/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 20 is 140

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 28 × 5 = 140,
    20/28 = 20 × 5/28 × 5 = 100/140
  3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
    75/20 = 75 × 7/20 × 7 = 525/140
  4. Subtract the two like fractions:
    100/140 - 525/140 = 100 - 525/140 = -425/140
  5. After reducing the fraction, the answer is -85/28

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