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Add 15/20 and 70/90

15/20 + 70/90 is 55/36.

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,
    70/90 = 70 × 2/90 × 2 = 140/180
  4. Add the two fractions:
    135/180 + 140/180 = 135 + 140/180 = 275/180
  5. 275/180 simplified gives 55/36
  6. So, 15/20 + 70/90 = 55/36
    In mixed form: 119/36

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