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Add 20/12 and 1/21

1st number: 1 8/12, 2nd number: 1/21

20/12 + 1/21 is 12/7.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 21 is 84
  2. For the 1st fraction, since 12 × 7 = 84,
    20/12 = 20 × 7/12 × 7 = 140/84
  3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
    1/21 = 1 × 4/21 × 4 = 4/84
  4. Add the two fractions:
    140/84 + 4/84 = 140 + 4/84 = 144/84
  5. After reducing the fraction, the answer is 12/7
  6. In mixed form: 15/7

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