Answers

Add 21/81 and 63/4

1^st number: 21/81, 2^nd number: 15 3/4

21/81 + 63/4 is 1729/108.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 4 is 324
   
   Next, find the equivalent fraction of both fractional numbers with denominator 324
2. For the 1st fraction, since 81 × 4 = 324,
   21/81 = 21 × 4/81 × 4 = 84/324
3. Likewise, for the 2nd fraction, since 4 × 81 = 324,
   63/4 = 63 × 81/4 × 81 = 5103/324
4. Add the two like fractions:
   84/324 + 5103/324 = 84 + 5103/324 = 5187/324
5. 5187/324 simplified gives 1729/108
6. So, 21/81 + 63/4 = 1729/108
   In mixed form: 161/108

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