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Add 5/21 and 9/20

5/21 + 9/20 is 289/420.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 21 × 20 = 420,
    5/21 = 5 × 20/21 × 20 = 100/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    9/20 = 9 × 21/20 × 21 = 189/420
  4. Add the two like fractions:
    100/420 + 189/420 = 100 + 189/420 = 289/420
  5. So, 5/21 + 9/20 = 289/420

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