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Add 28/15 and 42/90

1st number: 1 13/15, 2nd number: 42/90

28/15 + 42/90 is 7/3.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 90 is 90
  2. For the 1st fraction, since 15 × 6 = 90,
    28/15 = 28 × 6/15 × 6 = 168/90
  3. Likewise, for the 2nd fraction, since 90 × 1 = 90,
    42/90 = 42 × 1/90 × 1 = 42/90
  4. Add the two fractions:
    168/90 + 42/90 = 168 + 42/90 = 210/90
  5. 210/90 simplified gives 7/3
  6. So, 28/15 + 42/90 = 7/3
    In mixed form: 21/3

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