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Add 16/21 and 3/5

16/21 + 3/5 is 143/105.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 5 is 105
  2. For the 1st fraction, since 21 × 5 = 105,
    16/21 = 16 × 5/21 × 5 = 80/105
  3. Likewise, for the 2nd fraction, since 5 × 21 = 105,
    3/5 = 3 × 21/5 × 21 = 63/105
  4. Add the two fractions:
    80/105 + 63/105 = 80 + 63/105 = 143/105
  5. In mixed form: 138/105

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