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Add 45/72 and 80/90

45/72 + 80/90 is 109/72.

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,
    45/72 = 45 × 5/72 × 5 = 225/360
  3. Likewise, for the 2nd fraction, since 90 × 4 = 360,
    80/90 = 80 × 4/90 × 4 = 320/360
  4. Add the two like fractions:
    225/360 + 320/360 = 225 + 320/360 = 545/360
  5. 545/360 simplified gives 109/72
  6. So, 45/72 + 80/90 = 109/72
    In mixed form: 137/72

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