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Add 42/84 and 1/90

42/84 + 1/90 is 23/45.

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,
    1/90 = 1 × 14/90 × 14 = 14/1260
  4. Add the two fractions:
    630/1260 + 14/1260 = 630 + 14/1260 = 644/1260
  5. After reducing the fraction, the answer is 23/45

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