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Add 9/20 and 12/21

9/20 + 12/21 is 143/140.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 21 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 20 × 21 = 420,
    9/20 = 9 × 21/20 × 21 = 189/420
  3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
    12/21 = 12 × 20/21 × 20 = 240/420
  4. Add the two like fractions:
    189/420 + 240/420 = 189 + 240/420 = 429/420
  5. 429/420 simplified gives 143/140
  6. So, 9/20 + 12/21 = 143/140
    In mixed form: 13/140

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