Answers

Add 90/20 and 70/63

1^st number: 4 10/20, 2^nd number: 1 7/63

90/20 + 70/63 is 101/18.

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,
   70/63 = 70 × 20/63 × 20 = 1400/1260
4. Add the two like fractions:
   5670/1260 + 1400/1260 = 5670 + 1400/1260 = 7070/1260
5. 7070/1260 simplified gives 101/18
6. So, 90/20 + 70/63 = 101/18
   In mixed form: 511/18

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