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Add 12/54 and 3/21

12/54 + 3/21 is 23/63.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 378
  2. For the 1st fraction, since 54 × 7 = 378,
    12/54 = 12 × 7/54 × 7 = 84/378
  3. Likewise, for the 2nd fraction, since 21 × 18 = 378,
    3/21 = 3 × 18/21 × 18 = 54/378
  4. Add the two like fractions:
    84/378 + 54/378 = 84 + 54/378 = 138/378
  5. 138/378 simplified gives 23/63
  6. So, 12/54 + 3/21 = 23/63

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