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Add 18/15 and 21/80

1st number: 1 3/15, 2nd number: 21/80

18/15 + 21/80 is 117/80.

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,
    18/15 = 18 × 16/15 × 16 = 288/240
  3. Likewise, for the 2nd fraction, since 80 × 3 = 240,
    21/80 = 21 × 3/80 × 3 = 63/240
  4. Add the two like fractions:
    288/240 + 63/240 = 288 + 63/240 = 351/240
  5. 351/240 simplified gives 117/80
  6. So, 18/15 + 21/80 = 117/80
    In mixed form: 137/80

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