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Add 21/20 and 12/21

1st number: 1 1/20, 2nd number: 12/21

21/20 + 12/21 is 227/140.

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,
    21/20 = 21 × 21/20 × 21 = 441/420
  3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
    12/21 = 12 × 20/21 × 20 = 240/420
  4. Add the two like fractions:
    441/420 + 240/420 = 441 + 240/420 = 681/420
  5. 681/420 simplified gives 227/140
  6. So, 21/20 + 12/21 = 227/140
    In mixed form: 187/140

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