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Add 12/21 and 2/5

12/21 + 2/5 is 34/35.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 5 is 105

    Next, find the equivalent fraction of both fractional numbers with denominator 105
  2. For the 1st fraction, since 21 × 5 = 105,
    12/21 = 12 × 5/21 × 5 = 60/105
  3. Likewise, for the 2nd fraction, since 5 × 21 = 105,
    2/5 = 2 × 21/5 × 21 = 42/105
  4. Add the two like fractions:
    60/105 + 42/105 = 60 + 42/105 = 102/105
  5. 102/105 simplified gives 34/35
  6. So, 12/21 + 2/5 = 34/35

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