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Add 15/20 and 40/81

15/20 + 40/81 is 403/324.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 81 is 1620

    Next, find the equivalent fraction of both fractional numbers with denominator 1620
  2. For the 1st fraction, since 20 × 81 = 1620,
    15/20 = 15 × 81/20 × 81 = 1215/1620
  3. Likewise, for the 2nd fraction, since 81 × 20 = 1620,
    40/81 = 40 × 20/81 × 20 = 800/1620
  4. Add the two like fractions:
    1215/1620 + 800/1620 = 1215 + 800/1620 = 2015/1620
  5. 2015/1620 simplified gives 403/324
  6. So, 15/20 + 40/81 = 403/324
    In mixed form: 179/324

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