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Add 18/20 and 81/98

18/20 + 81/98 is 423/245.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 98 is 980

    Next, find the equivalent fraction of both fractional numbers with denominator 980
  2. For the 1st fraction, since 20 × 49 = 980,
    18/20 = 18 × 49/20 × 49 = 882/980
  3. Likewise, for the 2nd fraction, since 98 × 10 = 980,
    81/98 = 81 × 10/98 × 10 = 810/980
  4. Add the two like fractions:
    882/980 + 810/980 = 882 + 810/980 = 1692/980
  5. 1692/980 simplified gives 423/245
  6. So, 18/20 + 81/98 = 423/245
    In mixed form: 1178/245

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