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Add 81/90 and 18/36

81/90 + 18/36 is 7/5.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 36 is 180

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 90 × 2 = 180,
    81/90 = 81 × 2/90 × 2 = 162/180
  3. Likewise, for the 2nd fraction, since 36 × 5 = 180,
    18/36 = 18 × 5/36 × 5 = 90/180
  4. Add the two like fractions:
    162/180 + 90/180 = 162 + 90/180 = 252/180
  5. 252/180 simplified gives 7/5
  6. So, 81/90 + 18/36 = 7/5
    In mixed form: 12/5

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