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Add 18/21 and 9/30

18/21 + 9/30 is 81/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 30 is 210
  2. For the 1st fraction, since 21 × 10 = 210,
    18/21 = 18 × 10/21 × 10 = 180/210
  3. Likewise, for the 2nd fraction, since 30 × 7 = 210,
    9/30 = 9 × 7/30 × 7 = 63/210
  4. Add the two fractions:
    180/210 + 63/210 = 180 + 63/210 = 243/210
  5. After reducing the fraction, the answer is 81/70
  6. In mixed form: 111/70

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