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Add 20/21 and 25/80

20/21 + 25/80 is 425/336.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 80 is 1680

    Next, find the equivalent fraction of both fractional numbers with denominator 1680
  2. For the 1st fraction, since 21 × 80 = 1680,
    20/21 = 20 × 80/21 × 80 = 1600/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    25/80 = 25 × 21/80 × 21 = 525/1680
  4. Add the two like fractions:
    1600/1680 + 525/1680 = 1600 + 525/1680 = 2125/1680
  5. 2125/1680 simplified gives 425/336
  6. So, 20/21 + 25/80 = 425/336
    In mixed form: 189/336

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