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Add 18/40 and 70/90

18/40 + 70/90 is 221/180.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 90 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 40 × 9 = 360,
    18/40 = 18 × 9/40 × 9 = 162/360
  3. Likewise, for the 2nd fraction, since 90 × 4 = 360,
    70/90 = 70 × 4/90 × 4 = 280/360
  4. Add the two like fractions:
    162/360 + 280/360 = 162 + 280/360 = 442/360
  5. 442/360 simplified gives 221/180
  6. So, 18/40 + 70/90 = 221/180
    In mixed form: 141/180

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