Answers

Add 20/84 and 3/90

20/84 + 3/90 is 19/70.

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,
   3/90 = 3 × 14/90 × 14 = 42/1260
4. Add the two like fractions:
   300/1260 + 42/1260 = 300 + 42/1260 = 342/1260
5. 342/1260 simplified gives 19/70
6. So, 20/84 + 3/90 = 19/70

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