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Add 3/5 and 4/21

3/5 + 4/21 is 83/105.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 21 is 105
  2. For the 1st fraction, since 5 × 21 = 105,
    3/5 = 3 × 21/5 × 21 = 63/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    4/21 = 4 × 5/21 × 5 = 20/105
  4. Add the two fractions:
    63/105 + 20/105 = 63 + 20/105 = 83/105
  5. So, 3/5 + 4/21 = 83/105

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