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Add 18/21 and 35/42

18/21 + 35/42 is 71/42.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 42 is 42

    Next, find the equivalent fraction of both fractional numbers with denominator 42
  2. For the 1st fraction, since 21 × 2 = 42,
    18/21 = 18 × 2/21 × 2 = 36/42
  3. Likewise, for the 2nd fraction, since 42 × 1 = 42,
    35/42 = 35 × 1/42 × 1 = 35/42
  4. Add the two like fractions:
    36/42 + 35/42 = 36 + 35/42 = 71/42
  5. So, 18/21 + 35/42 = 71/42
    In mixed form: 129/42

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