Answers

Add 28/84 and 9/90

28/84 + 9/90 is 13/30.

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,
   28/84 = 28 × 15/84 × 15 = 420/1260
3. Likewise, for the 2nd fraction, since 90 × 14 = 1260,
   9/90 = 9 × 14/90 × 14 = 126/1260
4. Add the two like fractions:
   420/1260 + 126/1260 = 420 + 126/1260 = 546/1260
5. 546/1260 simplified gives 13/30
6. So, 28/84 + 9/90 = 13/30

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