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Add 7/18 and 42/70

7/18 + 42/70 is 89/90.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 70 is 630
  2. For the 1st fraction, since 18 × 35 = 630,
    7/18 = 7 × 35/18 × 35 = 245/630
  3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
    42/70 = 42 × 9/70 × 9 = 378/630
  4. Add the two fractions:
    245/630 + 378/630 = 245 + 378/630 = 623/630
  5. After reducing the fraction, the answer is 89/90

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