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Add 3/42 and 15/18

3/42 + 15/18 is 19/21.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 18 is 126
  2. For the 1st fraction, since 42 × 3 = 126,
    3/42 = 3 × 3/42 × 3 = 9/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    15/18 = 15 × 7/18 × 7 = 105/126
  4. Add the two fractions:
    9/126 + 105/126 = 9 + 105/126 = 114/126
  5. After reducing the fraction, the answer is 19/21

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