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Add 15/18 and 4/20

15/18 + 4/20 is 31/30.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 20 is 180

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 18 × 10 = 180,
    15/18 = 15 × 10/18 × 10 = 150/180
  3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
    4/20 = 4 × 9/20 × 9 = 36/180
  4. Add the two like fractions:
    150/180 + 36/180 = 150 + 36/180 = 186/180
  5. 186/180 simplified gives 31/30
  6. So, 15/18 + 4/20 = 31/30
    In mixed form: 11/30

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