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Add 21/18 and 35/20

1st number: 1 3/18, 2nd number: 1 15/20

21/18 + 35/20 is 35/12.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 20 is 180
  2. For the 1st fraction, since 18 × 10 = 180,
    21/18 = 21 × 10/18 × 10 = 210/180
  3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
    35/20 = 35 × 9/20 × 9 = 315/180
  4. Add the two fractions:
    210/180 + 315/180 = 210 + 315/180 = 525/180
  5. After reducing the fraction, the answer is 35/12
  6. In mixed form: 211/12

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