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Add 20/35 and 4/21

20/35 + 4/21 is 16/21.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 35 and 21 is 105

    Next, find the equivalent fraction of both fractional numbers with denominator 105
  2. For the 1st fraction, since 35 × 3 = 105,
    20/35 = 20 × 3/35 × 3 = 60/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    4/21 = 4 × 5/21 × 5 = 20/105
  4. Add the two like fractions:
    60/105 + 20/105 = 60 + 20/105 = 80/105
  5. 80/105 simplified gives 16/21
  6. So, 20/35 + 4/21 = 16/21

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