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Add 28/72 and 42/90

28/72 + 42/90 is 77/90.

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,
    42/90 = 42 × 4/90 × 4 = 168/360
  4. Add the two like fractions:
    140/360 + 168/360 = 140 + 168/360 = 308/360
  5. 308/360 simplified gives 77/90
  6. So, 28/72 + 42/90 = 77/90

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