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Add 28/21 and 7/9

1st number: 1 7/21, 2nd number: 7/9

28/21 + 7/9 is 19/9.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 9 is 63
  2. For the 1st fraction, since 21 × 3 = 63,
    28/21 = 28 × 3/21 × 3 = 84/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    7/9 = 7 × 7/9 × 7 = 49/63
  4. Add the two fractions:
    84/63 + 49/63 = 84 + 49/63 = 133/63
  5. 133/63 simplified gives 19/9
  6. So, 28/21 + 7/9 = 19/9
    In mixed form: 21/9

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