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Add 21/20 and 9/18

1st number: 1 1/20, 2nd number: 9/18

21/20 + 9/18 is 31/20.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 20 × 9 = 180,
    21/20 = 21 × 9/20 × 9 = 189/180
  3. Likewise, for the 2nd fraction, since 18 × 10 = 180,
    9/18 = 9 × 10/18 × 10 = 90/180
  4. Add the two like fractions:
    189/180 + 90/180 = 189 + 90/180 = 279/180
  5. 279/180 simplified gives 31/20
  6. So, 21/20 + 9/18 = 31/20
    In mixed form: 111/20

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