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Add 12/20 and 28/21

1st number: 12/20, 2nd number: 1 7/21

12/20 + 28/21 is 29/15.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 21 is 420
  2. For the 1st fraction, since 20 × 21 = 420,
    12/20 = 12 × 21/20 × 21 = 252/420
  3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
    28/21 = 28 × 20/21 × 20 = 560/420
  4. Add the two fractions:
    252/420 + 560/420 = 252 + 560/420 = 812/420
  5. 812/420 simplified gives 29/15
  6. So, 12/20 + 28/21 = 29/15
    In mixed form: 114/15

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