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Add 21/20 and 18/9

1st number: 1 1/20, 2nd number: 2 0/9

21/20 + 18/9 is 61/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 9 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 9 × 20 = 180,
    18/9 = 18 × 20/9 × 20 = 360/180
  4. Add the two like fractions:
    189/180 + 360/180 = 189 + 360/180 = 549/180
  5. 549/180 simplified gives 61/20
  6. So, 21/20 + 18/9 = 61/20
    In mixed form: 31/20

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