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Add 28/72 and 30/90

28/72 + 30/90 is 13/18.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 90 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 90 × 4 = 360,
    30/90 = 30 × 4/90 × 4 = 120/360
  4. Add the two like fractions:
    140/360 + 120/360 = 140 + 120/360 = 260/360
  5. 260/360 simplified gives 13/18
  6. So, 28/72 + 30/90 = 13/18

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