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Add 8/20 and 15/21

8/20 + 15/21 is 39/35.

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,
    15/21 = 15 × 20/21 × 20 = 300/420
  4. Add the two fractions:
    168/420 + 300/420 = 168 + 300/420 = 468/420
  5. After reducing the fraction, the answer is 39/35
  6. In mixed form: 14/35

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