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Add 20/42 and 12/70

20/42 + 12/70 is 68/105.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 70 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 42 × 5 = 210,
    20/42 = 20 × 5/42 × 5 = 100/210
  3. Likewise, for the 2nd fraction, since 70 × 3 = 210,
    12/70 = 12 × 3/70 × 3 = 36/210
  4. Add the two like fractions:
    100/210 + 36/210 = 100 + 36/210 = 136/210
  5. 136/210 simplified gives 68/105
  6. So, 20/42 + 12/70 = 68/105

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