This was created for first and second graders to understand how addition can be solved with subtraction with an unknown addend. There are a total of 22 pages, with 20 unique real-life problems to reinforce the concept of subtraction. The last page offers a fill-in-the-blank template for student-created examples. I used the file on a smart board with the entire class, but it could be printed in a workbook or task card format for independent practice.