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Add 8/20 and 12/21

8/20 + 12/21 is 34/35.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 21 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 20 × 21 = 420,
    8/20 = 8 × 21/20 × 21 = 168/420
  3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
    12/21 = 12 × 20/21 × 20 = 240/420
  4. Add the two like fractions:
    168/420 + 240/420 = 168 + 240/420 = 408/420
  5. 408/420 simplified gives 34/35
  6. So, 8/20 + 12/21 = 34/35

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