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Add 1/21 and 8/20

1/21 + 8/20 is 47/105.

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,
    1/21 = 1 × 20/21 × 20 = 20/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    8/20 = 8 × 21/20 × 21 = 168/420
  4. Add the two fractions:
    20/420 + 168/420 = 20 + 168/420 = 188/420
  5. After reducing the fraction, the answer is 47/105

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