Paul got a box of 457 erasers and 617 crayons for his birthday. At the end of the school year he only had 523 crayons left while not having lost a single eraser. How many more crayons than erasers did he have left?
First, we'll figure out how many crayons Paul started with. We know that he got 457 erasers and 617 crayons for his birthday. So, we can say that: 

457 erasers + 617 crayons = 1074 total

Next, we'll figure out how many crayons Paul had at the end of the school year. We know that he had 523 crayons left, and we also know that he didn't lose any erasers. So, we can say that: 

457 erasers + 523 crayons = 980 total

Now, we have enough information to solve the problem. We know that Paul started with 1074 total items, and he ended with 980 total items. So, we can say that: 

1074 total items - 980 total items = 94

Paul had 94 more crayons than erasers at the end of the school year.