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Add 12/15 and 21/80

12/15 + 21/80 is 17/16.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 80 is 240

    Next, find the equivalent fraction of both fractional numbers with denominator 240
  2. For the 1st fraction, since 15 × 16 = 240,
    12/15 = 12 × 16/15 × 16 = 192/240
  3. Likewise, for the 2nd fraction, since 80 × 3 = 240,
    21/80 = 21 × 3/80 × 3 = 63/240
  4. Add the two like fractions:
    192/240 + 63/240 = 192 + 63/240 = 255/240
  5. 255/240 simplified gives 17/16
  6. So, 12/15 + 21/80 = 17/16
    In mixed form: 11/16

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