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Add 20/21 and 45/12

1st number: 20/21, 2nd number: 3 9/12

20/21 + 45/12 is 395/84.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 12 is 84
  2. For the 1st fraction, since 21 × 4 = 84,
    20/21 = 20 × 4/21 × 4 = 80/84
  3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
    45/12 = 45 × 7/12 × 7 = 315/84
  4. Add the two fractions:
    80/84 + 315/84 = 80 + 315/84 = 395/84
  5. In mixed form: 459/84

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