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Add 70/18 and 90/20

1st number: 3 16/18, 2nd number: 4 10/20

70/18 + 90/20 is 151/18.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 20 is 180
  2. For the 1st fraction, since 18 × 10 = 180,
    70/18 = 70 × 10/18 × 10 = 700/180
  3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
    90/20 = 90 × 9/20 × 9 = 810/180
  4. Add the two fractions:
    700/180 + 810/180 = 700 + 810/180 = 1510/180
  5. 1510/180 simplified gives 151/18
  6. So, 70/18 + 90/20 = 151/18
    In mixed form: 87/18

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