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Add 3/42 and 15/90

3/42 + 15/90 is 5/21.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 90 is 630
  2. For the 1st fraction, since 42 × 15 = 630,
    3/42 = 3 × 15/42 × 15 = 45/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    15/90 = 15 × 7/90 × 7 = 105/630
  4. Add the two fractions:
    45/630 + 105/630 = 45 + 105/630 = 150/630
  5. After reducing the fraction, the answer is 5/21

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