Answers

Add 98/40 and 7/81

1^st number: 2 18/40, 2^nd number: 7/81

98/40 + 7/81 is 4109/1620.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 81 is 3240
   
   Next, find the equivalent fraction of both fractional numbers with denominator 3240
2. For the 1st fraction, since 40 × 81 = 3240,
   98/40 = 98 × 81/40 × 81 = 7938/3240
3. Likewise, for the 2nd fraction, since 81 × 40 = 3240,
   7/81 = 7 × 40/81 × 40 = 280/3240
4. Add the two like fractions:
   7938/3240 + 280/3240 = 7938 + 280/3240 = 8218/3240
5. 8218/3240 simplified gives 4109/1620
6. So, 98/40 + 7/81 = 4109/1620
   In mixed form: 2869/1620

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