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Add 40/80 and 15/21

40/80 + 15/21 is 17/14.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 21 is 1680

    Next, find the equivalent fraction of both fractional numbers with denominator 1680
  2. For the 1st fraction, since 80 × 21 = 1680,
    40/80 = 40 × 21/80 × 21 = 840/1680
  3. Likewise, for the 2nd fraction, since 21 × 80 = 1680,
    15/21 = 15 × 80/21 × 80 = 1200/1680
  4. Add the two like fractions:
    840/1680 + 1200/1680 = 840 + 1200/1680 = 2040/1680
  5. 2040/1680 simplified gives 17/14
  6. So, 40/80 + 15/21 = 17/14
    In mixed form: 13/14

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