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Add 1/5 and 12/21

1/5 + 12/21 is 27/35.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 105
  2. For the 1st fraction, since 5 × 21 = 105,
    1/5 = 1 × 21/5 × 21 = 21/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    12/21 = 12 × 5/21 × 5 = 60/105
  4. Add the two like fractions:
    21/105 + 60/105 = 21 + 60/105 = 81/105
  5. 81/105 simplified gives 27/35
  6. So, 1/5 + 12/21 = 27/35

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