Answers

Add 80/84 and 18/63

80/84 + 18/63 is 26/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 63 is 252
   
   Next, find the equivalent fraction of both fractional numbers with denominator 252
2. For the 1st fraction, since 84 × 3 = 252,
   80/84 = 80 × 3/84 × 3 = 240/252
3. Likewise, for the 2nd fraction, since 63 × 4 = 252,
   18/63 = 18 × 4/63 × 4 = 72/252
4. Add the two like fractions:
   240/252 + 72/252 = 240 + 72/252 = 312/252
5. 312/252 simplified gives 26/21
6. So, 80/84 + 18/63 = 26/21
   In mixed form: 15/21

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