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Add 20/42 and 7/15

20/42 + 7/15 is 33/35.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 15 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 15 × 14 = 210,
    7/15 = 7 × 14/15 × 14 = 98/210
  4. Add the two like fractions:
    100/210 + 98/210 = 100 + 98/210 = 198/210
  5. 198/210 simplified gives 33/35
  6. So, 20/42 + 7/15 = 33/35

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