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Add 15/20 and 15/90

15/20 + 15/90 is 11/12.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 90 is 180

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 20 × 9 = 180,
    15/20 = 15 × 9/20 × 9 = 135/180
  3. Likewise, for the 2nd fraction, since 90 × 2 = 180,
    15/90 = 15 × 2/90 × 2 = 30/180
  4. Add the two like fractions:
    135/180 + 30/180 = 135 + 30/180 = 165/180
  5. 165/180 simplified gives 11/12
  6. So, 15/20 + 15/90 = 11/12

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