Answers

Add 81/16 and 40/20

1^st number: 5 1/16, 2^nd number: 2 0/20

81/16 + 40/20 is 113/16.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 16 and 20 is 80
   
   Next, find the equivalent fraction of both fractional numbers with denominator 80
2. For the 1st fraction, since 16 × 5 = 80,
   81/16 = 81 × 5/16 × 5 = 405/80
3. Likewise, for the 2nd fraction, since 20 × 4 = 80,
   40/20 = 40 × 4/20 × 4 = 160/80
4. Add the two like fractions:
   405/80 + 160/80 = 405 + 160/80 = 565/80
5. 565/80 simplified gives 113/16
6. So, 81/16 + 40/20 = 113/16
   In mixed form: 71/16

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