Answers

Add 20/84 and 20/90

20/84 + 20/90 is 29/63.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 90 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 84 × 15 = 1260,
   20/84 = 20 × 15/84 × 15 = 300/1260
3. Likewise, for the 2nd fraction, since 90 × 14 = 1260,
   20/90 = 20 × 14/90 × 14 = 280/1260
4. Add the two like fractions:
   300/1260 + 280/1260 = 300 + 280/1260 = 580/1260
5. 580/1260 simplified gives 29/63
6. So, 20/84 + 20/90 = 29/63

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