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Subtract 4/20 from 28/72

28/72 - 4/20 is 17/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 20 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 72 × 5 = 360,
    28/72 = 28 × 5/72 × 5 = 140/360
  3. Likewise, for the 2nd fraction, since 20 × 18 = 360,
    4/20 = 4 × 18/20 × 18 = 72/360
  4. Subtract the two like fractions:
    140/360 - 72/360 = 140 - 72/360 = 68/360
  5. After reducing the fraction, the answer is 17/90

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