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Add 8/20 and 15/84

8/20 + 15/84 is 81/140.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 84 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 84 × 5 = 420,
    15/84 = 15 × 5/84 × 5 = 75/420
  4. Add the two like fractions:
    168/420 + 75/420 = 168 + 75/420 = 243/420
  5. 243/420 simplified gives 81/140
  6. So, 8/20 + 15/84 = 81/140

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