8 7/3 + 4 1/3
First, add the whole numbers:
8 + 4 = 12
Then, add the fractions:
3/7 + 1 /3
Find the LCM ( least common multiple) of the denominators ( bottom numbers )
21
Then multiply the top and bottom numbers by the same number to obtain 21 at the bottom.
Add the top numbers and keep the same denominator (21)
Join all :
12 16/21
Answer: