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Add 18/21 and 8/30

18/21 + 8/30 is 118/105.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 30 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 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,
    8/30 = 8 × 7/30 × 7 = 56/210
  4. Add the two like fractions:
    180/210 + 56/210 = 180 + 56/210 = 236/210
  5. 236/210 simplified gives 118/105
  6. So, 18/21 + 8/30 = 118/105
    In mixed form: 113/105

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