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Add 21/15 and 28/80

1st number: 1 6/15, 2nd number: 28/80

21/15 + 28/80 is 7/4.

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,
    21/15 = 21 × 16/15 × 16 = 336/240
  3. Likewise, for the 2nd fraction, since 80 × 3 = 240,
    28/80 = 28 × 3/80 × 3 = 84/240
  4. Add the two like fractions:
    336/240 + 84/240 = 336 + 84/240 = 420/240
  5. 420/240 simplified gives 7/4
  6. So, 21/15 + 28/80 = 7/4
    In mixed form: 13/4

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