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Add 9/21 and 20/42

9/21 + 20/42 is 19/21.

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,
    9/21 = 9 × 2/21 × 2 = 18/42
  3. Likewise, for the 2nd fraction, since 42 × 1 = 42,
    20/42 = 20 × 1/42 × 1 = 20/42
  4. Add the two like fractions:
    18/42 + 20/42 = 18 + 20/42 = 38/42
  5. 38/42 simplified gives 19/21
  6. So, 9/21 + 20/42 = 19/21

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