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Add 18/21 and 20/80

18/21 + 20/80 is 31/28.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 80 is 1680
  2. For the 1st fraction, since 21 × 80 = 1680,
    18/21 = 18 × 80/21 × 80 = 1440/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    20/80 = 20 × 21/80 × 21 = 420/1680
  4. Add the two fractions:
    1440/1680 + 420/1680 = 1440 + 420/1680 = 1860/1680
  5. 1860/1680 simplified gives 31/28
  6. So, 18/21 + 20/80 = 31/28
    In mixed form: 13/28

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