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Add 42/70 and 15/84

42/70 + 15/84 is 109/140.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 84 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 84 × 5 = 420,
    15/84 = 15 × 5/84 × 5 = 75/420
  4. Add the two fractions:
    252/420 + 75/420 = 252 + 75/420 = 327/420
  5. 327/420 simplified gives 109/140
  6. So, 42/70 + 15/84 = 109/140

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