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Add 18/30 and 81/84

18/30 + 81/84 is 219/140.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 84 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 30 × 14 = 420,
    18/30 = 18 × 14/30 × 14 = 252/420
  3. Likewise, for the 2nd fraction, since 84 × 5 = 420,
    81/84 = 81 × 5/84 × 5 = 405/420
  4. Add the two like fractions:
    252/420 + 405/420 = 252 + 405/420 = 657/420
  5. 657/420 simplified gives 219/140
  6. So, 18/30 + 81/84 = 219/140
    In mixed form: 179/140

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