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Add 84/90 and 20/72

84/90 + 20/72 is 109/90.

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,
    84/90 = 84 × 4/90 × 4 = 336/360
  3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
    20/72 = 20 × 5/72 × 5 = 100/360
  4. Add the two like fractions:
    336/360 + 100/360 = 336 + 100/360 = 436/360
  5. 436/360 simplified gives 109/90
  6. So, 84/90 + 20/72 = 109/90
    In mixed form: 119/90

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