Halloween Math Word Problems - Addition and Subtraction Task Cards. Halloween math fun. 30 task cards with addition and subtraction problems with a task card answer sheet included and key. Enjoy! Print out four to a page by adjusting your settings before you print. if your printer doesn't allow you to do this, you can adjust the paper size. (I like to print out on 4 x 6 index cards.) You can then laminate for durability.