Answers

Add 81/63 and 20/6

1^st number: 1 18/63, 2^nd number: 3 2/6

81/63 + 20/6 is 97/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 6 is 126
   
   Next, find the equivalent fraction of both fractional numbers with denominator 126
2. For the 1st fraction, since 63 × 2 = 126,
   81/63 = 81 × 2/63 × 2 = 162/126
3. Likewise, for the 2nd fraction, since 6 × 21 = 126,
   20/6 = 20 × 21/6 × 21 = 420/126
4. Add the two like fractions:
   162/126 + 420/126 = 162 + 420/126 = 582/126
5. 582/126 simplified gives 97/21
6. So, 81/63 + 20/6 = 97/21
   In mixed form: 413/21

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