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Add 18/56 and 42/70

18/56 + 42/70 is 129/140.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 56 and 70 is 280
  2. For the 1st fraction, since 56 × 5 = 280,
    18/56 = 18 × 5/56 × 5 = 90/280
  3. Likewise, for the 2nd fraction, since 70 × 4 = 280,
    42/70 = 42 × 4/70 × 4 = 168/280
  4. Add the two fractions:
    90/280 + 168/280 = 90 + 168/280 = 258/280
  5. 258/280 simplified gives 129/140
  6. So, 18/56 + 42/70 = 129/140

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