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Add 1/21 and 12/54

1/21 + 12/54 is 17/63.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 54 is 378

    Next, find the equivalent fraction of both fractional numbers with denominator 378
  2. For the 1st fraction, since 21 × 18 = 378,
    1/21 = 1 × 18/21 × 18 = 18/378
  3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
    12/54 = 12 × 7/54 × 7 = 84/378
  4. Add the two like fractions:
    18/378 + 84/378 = 18 + 84/378 = 102/378
  5. 102/378 simplified gives 17/63
  6. So, 1/21 + 12/54 = 17/63

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