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Add 28/90 and 12/15

28/90 + 12/15 is 10/9.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 15 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 90 × 1 = 90,
    28/90 = 28 × 1/90 × 1 = 28/90
  3. Likewise, for the 2nd fraction, since 15 × 6 = 90,
    12/15 = 12 × 6/15 × 6 = 72/90
  4. Add the two like fractions:
    28/90 + 72/90 = 28 + 72/90 = 100/90
  5. 100/90 simplified gives 10/9
  6. So, 28/90 + 12/15 = 10/9
    In mixed form: 11/9

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