Answers

Add 45/9 and 80/84

1^st number: 5 0/9, 2^nd number: 80/84

45/9 + 80/84 is 125/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 9 and 84 is 252
   
   Next, find the equivalent fraction of both fractional numbers with denominator 252
2. For the 1st fraction, since 9 × 28 = 252,
   45/9 = 45 × 28/9 × 28 = 1260/252
3. Likewise, for the 2nd fraction, since 84 × 3 = 252,
   80/84 = 80 × 3/84 × 3 = 240/252
4. Add the two like fractions:
   1260/252 + 240/252 = 1260 + 240/252 = 1500/252
5. 1500/252 simplified gives 125/21
6. So, 45/9 + 80/84 = 125/21
   In mixed form: 520/21

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