Answers

Add 90/20 and 80/63

1^st number: 4 10/20, 2^nd number: 1 17/63

90/20 + 80/63 is 727/126.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 63 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 20 × 63 = 1260,
   90/20 = 90 × 63/20 × 63 = 5670/1260
3. Likewise, for the 2nd fraction, since 63 × 20 = 1260,
   80/63 = 80 × 20/63 × 20 = 1600/1260
4. Add the two like fractions:
   5670/1260 + 1600/1260 = 5670 + 1600/1260 = 7270/1260
5. 7270/1260 simplified gives 727/126
6. So, 90/20 + 80/63 = 727/126
   In mixed form: 597/126

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