Answers

Add 20/70 and 63/90

20/70 + 63/90 is 69/70.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 90 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 70 × 9 = 630,
   20/70 = 20 × 9/70 × 9 = 180/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   63/90 = 63 × 7/90 × 7 = 441/630
4. Add the two like fractions:
   180/630 + 441/630 = 180 + 441/630 = 621/630
5. 621/630 simplified gives 69/70
6. So, 20/70 + 63/90 = 69/70

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