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Add 21/18 and 27/20

1st number: 1 3/18, 2nd number: 1 7/20

21/18 + 27/20 is 151/60.

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,
    27/20 = 27 × 9/20 × 9 = 243/180
  4. Add the two like fractions:
    210/180 + 243/180 = 210 + 243/180 = 453/180
  5. 453/180 simplified gives 151/60
  6. So, 21/18 + 27/20 = 151/60
    In mixed form: 231/60

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