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Add 28/35 and 18/84

28/35 + 18/84 is 71/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 35 and 84 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 35 × 12 = 420,
    28/35 = 28 × 12/35 × 12 = 336/420
  3. Likewise, for the 2nd fraction, since 84 × 5 = 420,
    18/84 = 18 × 5/84 × 5 = 90/420
  4. Add the two like fractions:
    336/420 + 90/420 = 336 + 90/420 = 426/420
  5. 426/420 simplified gives 71/70
  6. So, 28/35 + 18/84 = 71/70
    In mixed form: 11/70

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