Answers

Add 98/20 and 9/81

1^st number: 4 18/20, 2^nd number: 9/81

98/20 + 9/81 is 451/90.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 81 is 1620
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1620
2. For the 1st fraction, since 20 × 81 = 1620,
   98/20 = 98 × 81/20 × 81 = 7938/1620
3. Likewise, for the 2nd fraction, since 81 × 20 = 1620,
   9/81 = 9 × 20/81 × 20 = 180/1620
4. Add the two like fractions:
   7938/1620 + 180/1620 = 7938 + 180/1620 = 8118/1620
5. 8118/1620 simplified gives 451/90
6. So, 98/20 + 9/81 = 451/90
   In mixed form: 51/90

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