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Add 28/80 and 21/20

1st number: 28/80, 2nd number: 1 1/20

28/80 + 21/20 is 7/5.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 20 is 80

    Next, find the equivalent fraction of both fractional numbers with denominator 80
  2. For the 1st fraction, since 80 × 1 = 80,
    28/80 = 28 × 1/80 × 1 = 28/80
  3. Likewise, for the 2nd fraction, since 20 × 4 = 80,
    21/20 = 21 × 4/20 × 4 = 84/80
  4. Add the two like fractions:
    28/80 + 84/80 = 28 + 84/80 = 112/80
  5. 112/80 simplified gives 7/5
  6. So, 28/80 + 21/20 = 7/5
    In mixed form: 12/5

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