Answers

Add 63/4 and 45/80

1^st number: 15 3/4, 2^nd number: 45/80

63/4 + 45/80 is 261/16.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 4 and 80 is 80
   
   Next, find the equivalent fraction of both fractional numbers with denominator 80
2. For the 1st fraction, since 4 × 20 = 80,
   63/4 = 63 × 20/4 × 20 = 1260/80
3. Likewise, for the 2nd fraction, since 80 × 1 = 80,
   45/80 = 45 × 1/80 × 1 = 45/80
4. Add the two like fractions:
   1260/80 + 45/80 = 1260 + 45/80 = 1305/80
5. 1305/80 simplified gives 261/16
6. So, 63/4 + 45/80 = 261/16
   In mixed form: 165/16

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