Answers

Add 90/80 and 15/63

1^st number: 1 10/80, 2^nd number: 15/63

90/80 + 15/63 is 229/168.

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,
   90/80 = 90 × 63/80 × 63 = 5670/5040
3. Likewise, for the 2nd fraction, since 63 × 80 = 5040,
   15/63 = 15 × 80/63 × 80 = 1200/5040
4. Add the two like fractions:
   5670/5040 + 1200/5040 = 5670 + 1200/5040 = 6870/5040
5. 6870/5040 simplified gives 229/168
6. So, 90/80 + 15/63 = 229/168
   In mixed form: 161/168

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