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Add 12/20 and 4/42

12/20 + 4/42 is 73/105.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 42 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 42 × 10 = 420,
    4/42 = 4 × 10/42 × 10 = 40/420
  4. Add the two fractions:
    252/420 + 40/420 = 252 + 40/420 = 292/420
  5. After reducing the fraction, the answer is 73/105

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