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Add 1/21 and 4/15

1/21 + 4/15 is 11/35.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 15 is 105

    Next, find the equivalent fraction of both fractional numbers with denominator 105
  2. For the 1st fraction, since 21 × 5 = 105,
    1/21 = 1 × 5/21 × 5 = 5/105
  3. Likewise, for the 2nd fraction, since 15 × 7 = 105,
    4/15 = 4 × 7/15 × 7 = 28/105
  4. Add the two like fractions:
    5/105 + 28/105 = 5 + 28/105 = 33/105
  5. 33/105 simplified gives 11/35
  6. So, 1/21 + 4/15 = 11/35

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