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Add 28/90 and 42/72

28/90 + 42/72 is 161/180.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 72 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 90 × 4 = 360,
    28/90 = 28 × 4/90 × 4 = 112/360
  3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
    42/72 = 42 × 5/72 × 5 = 210/360
  4. Add the two like fractions:
    112/360 + 210/360 = 112 + 210/360 = 322/360
  5. 322/360 simplified gives 161/180
  6. So, 28/90 + 42/72 = 161/180

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