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Add 18/81 and 42/20

1st number: 18/81, 2nd number: 2 2/20

18/81 + 42/20 is 209/90.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 1620
  2. For the 1st fraction, since 81 × 20 = 1620,
    18/81 = 18 × 20/81 × 20 = 360/1620
  3. Likewise, for the 2nd fraction, since 20 × 81 = 1620,
    42/20 = 42 × 81/20 × 81 = 3402/1620
  4. Add the two like fractions:
    360/1620 + 3402/1620 = 360 + 3402/1620 = 3762/1620
  5. 3762/1620 simplified gives 209/90
  6. So, 18/81 + 42/20 = 209/90
    In mixed form: 229/90

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