Christine baked a pumpkin pie. she ate 1/6 of the pie. her brother ate 1/3 of it , and gave the left overs to his friends . what fraction of the pie did he gave to his friends?

Ok, so first you need to get the fractions to have the same denominator:
1/3 = 2/6 and 1/6 = 1/6
Add the two eaten parts together : 2/6+1/6=3/6
Now, subtract the eaten part ( 3/6 ) from the whole pie ( 6/6 or 1 whole)
6/6 - 3/6 = 3/6
So, he gave half of the pie to his friends because 3/6 = 1/2
Hope this helps! If you have any questions let me know!