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Add 90/12 and 15/20

1st number: 7 6/12, 2nd number: 15/20

90/12 + 15/20 is 33/4.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 20 is 60

    Next, find the equivalent fraction of both fractional numbers with denominator 60
  2. For the 1st fraction, since 12 × 5 = 60,
    90/12 = 90 × 5/12 × 5 = 450/60
  3. Likewise, for the 2nd fraction, since 20 × 3 = 60,
    15/20 = 15 × 3/20 × 3 = 45/60
  4. Add the two like fractions:
    450/60 + 45/60 = 450 + 45/60 = 495/60
  5. 495/60 simplified gives 33/4
  6. So, 90/12 + 15/20 = 33/4
    In mixed form: 81/4

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