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Add 15/20 and 45/90

15/20 + 45/90 is 5/4.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 90 is 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,
    45/90 = 45 × 2/90 × 2 = 90/180
  4. Add the two fractions:
    135/180 + 90/180 = 135 + 90/180 = 225/180
  5. After reducing the fraction, the answer is 5/4
  6. In mixed form: 11/4

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