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Add 28/21 and 12/45

1st number: 1 7/21, 2nd number: 12/45

28/21 + 12/45 is 8/5.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 45 is 315
  2. For the 1st fraction, since 21 × 15 = 315,
    28/21 = 28 × 15/21 × 15 = 420/315
  3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
    12/45 = 12 × 7/45 × 7 = 84/315
  4. Add the two fractions:
    420/315 + 84/315 = 420 + 84/315 = 504/315
  5. 504/315 simplified gives 8/5
  6. So, 28/21 + 12/45 = 8/5
    In mixed form: 13/5

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