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Add 10/21 and 21/20

1st number: 10/21, 2nd number: 1 1/20

10/21 + 21/20 is 641/420.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 20 is 420
  2. For the 1st fraction, since 21 × 20 = 420,
    10/21 = 10 × 20/21 × 20 = 200/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    21/20 = 21 × 21/20 × 21 = 441/420
  4. Add the two fractions:
    200/420 + 441/420 = 200 + 441/420 = 641/420
  5. In mixed form: 1221/420

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