Answers

Add 8/63 and 70/90

8/63 + 70/90 is 19/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 90 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 63 × 10 = 630,
   8/63 = 8 × 10/63 × 10 = 80/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   70/90 = 70 × 7/90 × 7 = 490/630
4. Add the two like fractions:
   80/630 + 490/630 = 80 + 490/630 = 570/630
5. 570/630 simplified gives 19/21
6. So, 8/63 + 70/90 = 19/21

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