36 addition problems with answer key included. The file will give you the ability to build for any level of addition that is being worked on. This is a very simple excel sheet that will allow for easier differentiation within the classroom. This also serves as a nice refresh with minimal effort required from the user. The file is ready to print and is an easy to read and follow format. The answer is included on the second tab. As you make changes for your situation, you will see the questions change based on the criteria you are entering. Hope you enjoy!