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Add 21/54 and 35/42

21/54 + 35/42 is 11/9.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 54 and 42 is 378

    Next, find the equivalent fraction of both fractional numbers with denominator 378
  2. For the 1st fraction, since 54 × 7 = 378,
    21/54 = 21 × 7/54 × 7 = 147/378
  3. Likewise, for the 2nd fraction, since 42 × 9 = 378,
    35/42 = 35 × 9/42 × 9 = 315/378
  4. Add the two like fractions:
    147/378 + 315/378 = 147 + 315/378 = 462/378
  5. 462/378 simplified gives 11/9
  6. So, 21/54 + 35/42 = 11/9
    In mixed form: 12/9

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