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Subtract 4/72 from 28/20

1st number: 1 8/20, 2nd number: 4/72

28/20 - 4/72 is 121/90.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 20 × 18 = 360,
    28/20 = 28 × 18/20 × 18 = 504/360
  3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
    4/72 = 4 × 5/72 × 5 = 20/360
  4. Subtract the two like fractions:
    504/360 - 20/360 = 504 - 20/360 = 484/360
  5. After reducing the fraction, the answer is 121/90
  6. In mixed form: 131/90

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