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Add 20/21 and 4/20

20/21 + 4/20 is 121/105.

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,
    20/21 = 20 × 20/21 × 20 = 400/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    4/20 = 4 × 21/20 × 21 = 84/420
  4. Add the two like fractions:
    400/420 + 84/420 = 400 + 84/420 = 484/420
  5. 484/420 simplified gives 121/105
  6. So, 20/21 + 4/20 = 121/105
    In mixed form: 116/105

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