Answers

Add 81/84 and 63/8

1^st number: 81/84, 2^nd number: 7 7/8

81/84 + 63/8 is 495/56.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 8 is 168
   
   Next, find the equivalent fraction of both fractional numbers with denominator 168
2. For the 1st fraction, since 84 × 2 = 168,
   81/84 = 81 × 2/84 × 2 = 162/168
3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
   63/8 = 63 × 21/8 × 21 = 1323/168
4. Add the two like fractions:
   162/168 + 1323/168 = 162 + 1323/168 = 1485/168
5. 1485/168 simplified gives 495/56
6. So, 81/84 + 63/8 = 495/56
   In mixed form: 847/56

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