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Add 12/21 and 81/40

1st number: 12/21, 2nd number: 2 1/40

12/21 + 81/40 is 727/280.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 40 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 21 × 40 = 840,
    12/21 = 12 × 40/21 × 40 = 480/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    81/40 = 81 × 21/40 × 21 = 1701/840
  4. Add the two like fractions:
    480/840 + 1701/840 = 480 + 1701/840 = 2181/840
  5. 2181/840 simplified gives 727/280
  6. So, 12/21 + 81/40 = 727/280
    In mixed form: 2167/280

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