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Add 21/20 and 81/5

1st number: 1 1/20, 2nd number: 16 1/5

21/20 + 81/5 is 69/4.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 5 is 20

    Next, find the equivalent fraction of both fractional numbers with denominator 20
  2. For the 1st fraction, since 20 × 1 = 20,
    21/20 = 21 × 1/20 × 1 = 21/20
  3. Likewise, for the 2nd fraction, since 5 × 4 = 20,
    81/5 = 81 × 4/5 × 4 = 324/20
  4. Add the two like fractions:
    21/20 + 324/20 = 21 + 324/20 = 345/20
  5. 345/20 simplified gives 69/4
  6. So, 21/20 + 81/5 = 69/4
    In mixed form: 171/4

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