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Add 15/21 and 4/54

15/21 + 4/54 is 149/189.

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,
    15/21 = 15 × 18/21 × 18 = 270/378
  3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
    4/54 = 4 × 7/54 × 7 = 28/378
  4. Add the two like fractions:
    270/378 + 28/378 = 270 + 28/378 = 298/378
  5. 298/378 simplified gives 149/189
  6. So, 15/21 + 4/54 = 149/189

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