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Add 6/20 and 9/21

6/20 + 9/21 is 51/70.

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,
    6/20 = 6 × 21/20 × 21 = 126/420
  3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
    9/21 = 9 × 20/21 × 20 = 180/420
  4. Add the two fractions:
    126/420 + 180/420 = 126 + 180/420 = 306/420
  5. 306/420 simplified gives 51/70
  6. So, 6/20 + 9/21 = 51/70

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