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Add 28/72 and 45/80

28/72 + 45/80 is 137/144.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 80 is 720

    Next, find the equivalent fraction of both fractional numbers with denominator 720
  2. For the 1st fraction, since 72 × 10 = 720,
    28/72 = 28 × 10/72 × 10 = 280/720
  3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
    45/80 = 45 × 9/80 × 9 = 405/720
  4. Add the two like fractions:
    280/720 + 405/720 = 280 + 405/720 = 685/720
  5. 685/720 simplified gives 137/144
  6. So, 28/72 + 45/80 = 137/144

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