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Add 20/72 and 9/81

20/72 + 9/81 is 7/18.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 81 is 648

    Next, find the equivalent fraction of both fractional numbers with denominator 648
  2. For the 1st fraction, since 72 × 9 = 648,
    20/72 = 20 × 9/72 × 9 = 180/648
  3. Likewise, for the 2nd fraction, since 81 × 8 = 648,
    9/81 = 9 × 8/81 × 8 = 72/648
  4. Add the two like fractions:
    180/648 + 72/648 = 180 + 72/648 = 252/648
  5. 252/648 simplified gives 7/18
  6. So, 20/72 + 9/81 = 7/18

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