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Add 12/21 and 45/80

12/21 + 45/80 is 127/112.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 1680
  2. For the 1st fraction, since 21 × 80 = 1680,
    12/21 = 12 × 80/21 × 80 = 960/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    45/80 = 45 × 21/80 × 21 = 945/1680
  4. Add the two like fractions:
    960/1680 + 945/1680 = 960 + 945/1680 = 1905/1680
  5. 1905/1680 simplified gives 127/112
  6. So, 12/21 + 45/80 = 127/112
    In mixed form: 115/112

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