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Add 20/40 and 42/81

20/40 + 42/81 is 55/54.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 81 is 3240

    Next, find the equivalent fraction of both fractional numbers with denominator 3240
  2. For the 1st fraction, since 40 × 81 = 3240,
    20/40 = 20 × 81/40 × 81 = 1620/3240
  3. Likewise, for the 2nd fraction, since 81 × 40 = 3240,
    42/81 = 42 × 40/81 × 40 = 1680/3240
  4. Add the two like fractions:
    1620/3240 + 1680/3240 = 1620 + 1680/3240 = 3300/3240
  5. 3300/3240 simplified gives 55/54
  6. So, 20/40 + 42/81 = 55/54
    In mixed form: 11/54

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