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Add 21/84 and 18/35

21/84 + 18/35 is 107/140.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 35 is 420
  2. For the 1st fraction, since 84 × 5 = 420,
    21/84 = 21 × 5/84 × 5 = 105/420
  3. Likewise, for the 2nd fraction, since 35 × 12 = 420,
    18/35 = 18 × 12/35 × 12 = 216/420
  4. Add the two fractions:
    105/420 + 216/420 = 105 + 216/420 = 321/420
  5. After reducing the fraction, the answer is 107/140

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