Answers

Add 20/63 and 40/90

20/63 + 40/90 is 16/21.

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,
   20/63 = 20 × 10/63 × 10 = 200/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   40/90 = 40 × 7/90 × 7 = 280/630
4. Add the two like fractions:
   200/630 + 280/630 = 200 + 280/630 = 480/630
5. 480/630 simplified gives 16/21
6. So, 20/63 + 40/90 = 16/21

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