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Add 12/42 and 5/21

12/42 + 5/21 is 11/21.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 21 is 42

    Next, find the equivalent fraction of both fractional numbers with denominator 42
  2. For the 1st fraction, since 42 × 1 = 42,
    12/42 = 12 × 1/42 × 1 = 12/42
  3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
    5/21 = 5 × 2/21 × 2 = 10/42
  4. Add the two like fractions:
    12/42 + 10/42 = 12 + 10/42 = 22/42
  5. 22/42 simplified gives 11/21
  6. So, 12/42 + 5/21 = 11/21

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