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Add 1/42 and 9/90

1/42 + 9/90 is 13/105.

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,
    1/42 = 1 × 15/42 × 15 = 15/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    9/90 = 9 × 7/90 × 7 = 63/630
  4. Add the two fractions:
    15/630 + 63/630 = 15 + 63/630 = 78/630
  5. After reducing the fraction, the answer is 13/105

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