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Add 8/20 and 9/21

8/20 + 9/21 is 29/35.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 21 is 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,
    9/21 = 9 × 20/21 × 20 = 180/420
  4. Add the two fractions:
    168/420 + 180/420 = 168 + 180/420 = 348/420
  5. After reducing the fraction, the answer is 29/35

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