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Add 18/21 and 18/30

18/21 + 18/30 is 51/35.

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,
    18/30 = 18 × 7/30 × 7 = 126/210
  4. Add the two fractions:
    180/210 + 126/210 = 180 + 126/210 = 306/210
  5. 306/210 simplified gives 51/35
  6. So, 18/21 + 18/30 = 51/35
    In mixed form: 116/35

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