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Add 21/3 and 81/20

1st number: 7 0/3, 2nd number: 4 1/20

21/3 + 81/20 is 221/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 3 and 20 is 60

    Next, find the equivalent fraction of both fractional numbers with denominator 60
  2. For the 1st fraction, since 3 × 20 = 60,
    21/3 = 21 × 20/3 × 20 = 420/60
  3. Likewise, for the 2nd fraction, since 20 × 3 = 60,
    81/20 = 81 × 3/20 × 3 = 243/60
  4. Add the two like fractions:
    420/60 + 243/60 = 420 + 243/60 = 663/60
  5. 663/60 simplified gives 221/20
  6. So, 21/3 + 81/20 = 221/20
    In mixed form: 111/20

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