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Add 12/4 and 28/21

1st number: 3 0/4, 2nd number: 1 7/21

12/4 + 28/21 is 13/3.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 21 is 84
  2. For the 1st fraction, since 4 × 21 = 84,
    12/4 = 12 × 21/4 × 21 = 252/84
  3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
    28/21 = 28 × 4/21 × 4 = 112/84
  4. Add the two fractions:
    252/84 + 112/84 = 252 + 112/84 = 364/84
  5. 364/84 simplified gives 13/3
  6. So, 12/4 + 28/21 = 13/3
    In mixed form: 41/3

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