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Add 28/40 and 7/81

28/40 + 7/81 is 637/810.

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,
    28/40 = 28 × 81/40 × 81 = 2268/3240
  3. Likewise, for the 2nd fraction, since 81 × 40 = 3240,
    7/81 = 7 × 40/81 × 40 = 280/3240
  4. Add the two like fractions:
    2268/3240 + 280/3240 = 2268 + 280/3240 = 2548/3240
  5. 2548/3240 simplified gives 637/810
  6. So, 28/40 + 7/81 = 637/810

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