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Add 90/20 and 10/21

1st number: 4 10/20, 2nd number: 10/21

90/20 + 10/21 is 209/42.

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,
    90/20 = 90 × 21/20 × 21 = 1890/420
  3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
    10/21 = 10 × 20/21 × 20 = 200/420
  4. Add the two like fractions:
    1890/420 + 200/420 = 1890 + 200/420 = 2090/420
  5. 2090/420 simplified gives 209/42
  6. So, 90/20 + 10/21 = 209/42
    In mixed form: 441/42

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