Answers

Add 12/21 and 18/84

12/21 + 18/84 is 11/14.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 84 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 21 × 4 = 84,
   12/21 = 12 × 4/21 × 4 = 48/84
3. Likewise, for the 2nd fraction, since 84 × 1 = 84,
   18/84 = 18 × 1/84 × 1 = 18/84
4. Add the two like fractions:
   48/84 + 18/84 = 48 + 18/84 = 66/84
5. 66/84 simplified gives 11/14
6. So, 12/21 + 18/84 = 11/14

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