Answers

Add 15/21 and 8/14

15/21 + 8/14 is 9/7.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 14 is 42
   
   Next, find the equivalent fraction of both fractional numbers with denominator 42
2. For the 1st fraction, since 21 × 2 = 42,
   15/21 = 15 × 2/21 × 2 = 30/42
3. Likewise, for the 2nd fraction, since 14 × 3 = 42,
   8/14 = 8 × 3/14 × 3 = 24/42
4. Add the two like fractions:
   30/42 + 24/42 = 30 + 24/42 = 54/42
5. 54/42 simplified gives 9/7
6. So, 15/21 + 8/14 = 9/7
   In mixed form: 12/7

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