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Add 18/21 and 27/54

18/21 + 27/54 is 19/14.

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,
    18/21 = 18 × 18/21 × 18 = 324/378
  3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
    27/54 = 27 × 7/54 × 7 = 189/378
  4. Add the two like fractions:
    324/378 + 189/378 = 324 + 189/378 = 513/378
  5. 513/378 simplified gives 19/14
  6. So, 18/21 + 27/54 = 19/14
    In mixed form: 15/14

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