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Add 3/21 and 12/18

3/21 + 12/18 is 17/21.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 18 is 126

    Next, find the equivalent fraction of both fractional numbers with denominator 126
  2. For the 1st fraction, since 21 × 6 = 126,
    3/21 = 3 × 6/21 × 6 = 18/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    12/18 = 12 × 7/18 × 7 = 84/126
  4. Add the two like fractions:
    18/126 + 84/126 = 18 + 84/126 = 102/126
  5. 102/126 simplified gives 17/21
  6. So, 3/21 + 12/18 = 17/21

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