This product is great for practicing subtraction with regrouping! There are 24 task cards. Some problems have regrouping some do not. Some task cards have word problems as well! Many times I place the task cards around the room. Students are able to work around the room completing each card. Once they have completed each card they are to check there answers! BEST PART!! There is a website (shortened website) at the top of the recording page. They are able to go the website and check each answer! Great for immediate feedback and the use of technology!