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Add 42/84 and 9/90

42/84 + 9/90 is 3/5.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 90 is 1260
  2. For the 1st fraction, since 84 × 15 = 1260,
    42/84 = 42 × 15/84 × 15 = 630/1260
  3. Likewise, for the 2nd fraction, since 90 × 14 = 1260,
    9/90 = 9 × 14/90 × 14 = 126/1260
  4. Add the two fractions:
    630/1260 + 126/1260 = 630 + 126/1260 = 756/1260
  5. After reducing the fraction, the answer is 3/5

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