This file includes four worksheets to solve addition and subtraction word problems up to 18. The worksheets contain the word problem, a place to show work, and a self-checking QR code to reveal the correct answer. This product would be best used by 1st graders in a math center, a small group, or as an independent activity. You will need a device, such as an iPad, to check the QR code answers. These worksheets are Common Core aligned for first grade.