It is spooky what your local library can do for you. If you need a copy and don't have a printer, go on down to the library they will give you a howling good deal! Halloween Math Centers (first grade - includes free printable)
This is just a worksheet I created to help students practice addition with 3 addends. Students can work individually or in groups to roll 3 dice, record the numbers, and add them together to find the solution.