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Add 80/81 and 8/90

80/81 + 8/90 is 436/405.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 81 and 90 is 810

    Next, find the equivalent fraction of both fractional numbers with denominator 810
  2. For the 1st fraction, since 81 × 10 = 810,
    80/81 = 80 × 10/81 × 10 = 800/810
  3. Likewise, for the 2nd fraction, since 90 × 9 = 810,
    8/90 = 8 × 9/90 × 9 = 72/810
  4. Add the two like fractions:
    800/810 + 72/810 = 800 + 72/810 = 872/810
  5. 872/810 simplified gives 436/405
  6. So, 80/81 + 8/90 = 436/405
    In mixed form: 131/405

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