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Add 21/18 and 18/20

1st number: 1 3/18, 2nd number: 18/20

21/18 + 18/20 is 31/15.

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,
    21/18 = 21 × 10/18 × 10 = 210/180
  3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
    18/20 = 18 × 9/20 × 9 = 162/180
  4. Add the two like fractions:
    210/180 + 162/180 = 210 + 162/180 = 372/180
  5. 372/180 simplified gives 31/15
  6. So, 21/18 + 18/20 = 31/15
    In mixed form: 21/15

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