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Add 1/5 and 3/21

1/5 + 3/21 is 12/35.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 21 is 105

    Next, find the equivalent fraction of both fractional numbers with denominator 105
  2. For the 1st fraction, since 5 × 21 = 105,
    1/5 = 1 × 21/5 × 21 = 21/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    3/21 = 3 × 5/21 × 5 = 15/105
  4. Add the two like fractions:
    21/105 + 15/105 = 21 + 15/105 = 36/105
  5. 36/105 simplified gives 12/35
  6. So, 1/5 + 3/21 = 12/35

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