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Add 20/42 and 20/21

20/42 + 20/21 is 10/7.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 42
  2. For the 1st fraction, since 42 × 1 = 42,
    20/42 = 20 × 1/42 × 1 = 20/42
  3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
    20/21 = 20 × 2/21 × 2 = 40/42
  4. Add the two like fractions:
    20/42 + 40/42 = 20 + 40/42 = 60/42
  5. 60/42 simplified gives 10/7
  6. So, 20/42 + 20/21 = 10/7
    In mixed form: 13/7

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