Answers

Add 90/20 and 28/63

1^st number: 4 10/20, 2^nd number: 28/63

90/20 + 28/63 is 89/18.

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,
   28/63 = 28 × 20/63 × 20 = 560/1260
4. Add the two like fractions:
   5670/1260 + 560/1260 = 5670 + 560/1260 = 6230/1260
5. 6230/1260 simplified gives 89/18
6. So, 90/20 + 28/63 = 89/18
   In mixed form: 417/18

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