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Add 20/40 and 70/81

20/40 + 70/81 is 221/162.

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,
    70/81 = 70 × 40/81 × 40 = 2800/3240
  4. Add the two like fractions:
    1620/3240 + 2800/3240 = 1620 + 2800/3240 = 4420/3240
  5. 4420/3240 simplified gives 221/162
  6. So, 20/40 + 70/81 = 221/162
    In mixed form: 159/162

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