Answers

Add 80/81 and 98/40

1^st number: 80/81, 2^nd number: 2 18/40

80/81 + 98/40 is 5569/1620.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 40 is 3240
   
   Next, find the equivalent fraction of both fractional numbers with denominator 3240
2. For the 1st fraction, since 81 × 40 = 3240,
   80/81 = 80 × 40/81 × 40 = 3200/3240
3. Likewise, for the 2nd fraction, since 40 × 81 = 3240,
   98/40 = 98 × 81/40 × 81 = 7938/3240
4. Add the two like fractions:
   3200/3240 + 7938/3240 = 3200 + 7938/3240 = 11138/3240
5. 11138/3240 simplified gives 5569/1620
6. So, 80/81 + 98/40 = 5569/1620
   In mixed form: 3709/1620

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