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Add 15/35 and 20/42

15/35 + 20/42 is 19/21.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 35 and 42 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 35 × 6 = 210,
    15/35 = 15 × 6/35 × 6 = 90/210
  3. Likewise, for the 2nd fraction, since 42 × 5 = 210,
    20/42 = 20 × 5/42 × 5 = 100/210
  4. Add the two like fractions:
    90/210 + 100/210 = 90 + 100/210 = 190/210
  5. 190/210 simplified gives 19/21
  6. So, 15/35 + 20/42 = 19/21

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