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Add 12/28 and 21/30

12/28 + 21/30 is 79/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 30 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 28 × 15 = 420,
    12/28 = 12 × 15/28 × 15 = 180/420
  3. Likewise, for the 2nd fraction, since 30 × 14 = 420,
    21/30 = 21 × 14/30 × 14 = 294/420
  4. Add the two like fractions:
    180/420 + 294/420 = 180 + 294/420 = 474/420
  5. 474/420 simplified gives 79/70
  6. So, 12/28 + 21/30 = 79/70
    In mixed form: 19/70

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