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Add 1/21 and 9/20

1/21 + 9/20 is 209/420.

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,
    1/21 = 1 × 20/21 × 20 = 20/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    9/20 = 9 × 21/20 × 21 = 189/420
  4. Add the two like fractions:
    20/420 + 189/420 = 20 + 189/420 = 209/420
  5. So, 1/21 + 9/20 = 209/420

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