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Add 16/20 and 42/81

16/20 + 42/81 is 178/135.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 1620
  2. For the 1st fraction, since 20 × 81 = 1620,
    16/20 = 16 × 81/20 × 81 = 1296/1620
  3. Likewise, for the 2nd fraction, since 81 × 20 = 1620,
    42/81 = 42 × 20/81 × 20 = 840/1620
  4. Add the two like fractions:
    1296/1620 + 840/1620 = 1296 + 840/1620 = 2136/1620
  5. 2136/1620 simplified gives 178/135
  6. So, 16/20 + 42/81 = 178/135
    In mixed form: 143/135

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