Answers

Add 81/80 and 28/63

1^st number: 1 1/80, 2^nd number: 28/63

81/80 + 28/63 is 1049/720.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 63 is 5040
   
   Next, find the equivalent fraction of both fractional numbers with denominator 5040
2. For the 1st fraction, since 80 × 63 = 5040,
   81/80 = 81 × 63/80 × 63 = 5103/5040
3. Likewise, for the 2nd fraction, since 63 × 80 = 5040,
   28/63 = 28 × 80/63 × 80 = 2240/5040
4. Add the two like fractions:
   5103/5040 + 2240/5040 = 5103 + 2240/5040 = 7343/5040
5. 7343/5040 simplified gives 1049/720
6. So, 81/80 + 28/63 = 1049/720
   In mixed form: 1329/720

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