Answers

Add 81/21 and 63/25

1^st number: 3 18/21, 2^nd number: 2 13/25

81/21 + 63/25 is 1116/175.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 25 is 525
   
   Next, find the equivalent fraction of both fractional numbers with denominator 525
2. For the 1st fraction, since 21 × 25 = 525,
   81/21 = 81 × 25/21 × 25 = 2025/525
3. Likewise, for the 2nd fraction, since 25 × 21 = 525,
   63/25 = 63 × 21/25 × 21 = 1323/525
4. Add the two like fractions:
   2025/525 + 1323/525 = 2025 + 1323/525 = 3348/525
5. 3348/525 simplified gives 1116/175
6. So, 81/21 + 63/25 = 1116/175
   In mixed form: 666/175

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