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Add 12/54 and 4/21

12/54 + 4/21 is 26/63.

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,
    4/21 = 4 × 18/21 × 18 = 72/378
  4. Add the two like fractions:
    84/378 + 72/378 = 84 + 72/378 = 156/378
  5. 156/378 simplified gives 26/63
  6. So, 12/54 + 4/21 = 26/63

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