This set is fun to use for as a center or small group activity during October, but can be used any time of year. Twenty four word problem task cards challenge students to use both addition and subtraction with and without regrouping. A costume price sheet is included, with a sheet of word problems to use along with it. These problems ask students to figure out which costumes can be bought for certain amounts, calculate price differences, and use other reasoning processes. A blank worksheet allows students to create their own word problems using the costume price sheet. Answer sheets are included for both the task card and price sheet activities.