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Add 20/36 and 18/81

20/36 + 18/81 is 7/9.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 36 and 81 is 324

    Next, find the equivalent fraction of both fractional numbers with denominator 324
  2. For the 1st fraction, since 36 × 9 = 324,
    20/36 = 20 × 9/36 × 9 = 180/324
  3. Likewise, for the 2nd fraction, since 81 × 4 = 324,
    18/81 = 18 × 4/81 × 4 = 72/324
  4. Add the two like fractions:
    180/324 + 72/324 = 180 + 72/324 = 252/324
  5. 252/324 simplified gives 7/9
  6. So, 20/36 + 18/81 = 7/9

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