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Add 8/20 and 3/21

8/20 + 3/21 is 19/35.

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,
    3/21 = 3 × 20/21 × 20 = 60/420
  4. Add the two fractions:
    168/420 + 60/420 = 168 + 60/420 = 228/420
  5. 228/420 simplified gives 19/35
  6. So, 8/20 + 3/21 = 19/35

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