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Add 42/70 and 3/12

42/70 + 3/12 is 17/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 12 is 420
  2. For the 1st fraction, since 70 × 6 = 420,
    42/70 = 42 × 6/70 × 6 = 252/420
  3. Likewise, for the 2nd fraction, since 12 × 35 = 420,
    3/12 = 3 × 35/12 × 35 = 105/420
  4. Add the two fractions:
    252/420 + 105/420 = 252 + 105/420 = 357/420
  5. After reducing the fraction, the answer is 17/20

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