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Add 80/21 and 9/28

1st number: 3 17/21, 2nd number: 9/28

80/21 + 9/28 is 347/84.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 28 is 84
  2. For the 1st fraction, since 21 × 4 = 84,
    80/21 = 80 × 4/21 × 4 = 320/84
  3. Likewise, for the 2nd fraction, since 28 × 3 = 84,
    9/28 = 9 × 3/28 × 3 = 27/84
  4. Add the two fractions:
    320/84 + 27/84 = 320 + 27/84 = 347/84
  5. In mixed form: 411/84

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