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Add 18/21 and 20/8

1st number: 18/21, 2nd number: 2 4/8

18/21 + 20/8 is 47/14.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 8 is 168
  2. For the 1st fraction, since 21 × 8 = 168,
    18/21 = 18 × 8/21 × 8 = 144/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    20/8 = 20 × 21/8 × 21 = 420/168
  4. Add the two fractions:
    144/168 + 420/168 = 144 + 420/168 = 564/168
  5. After reducing the fraction, the answer is 47/14
  6. In mixed form: 35/14

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