This is a Smartboard activity that gives students the opportunity to practice working with addition and subtraction facts within 20. Each page asks students to choose the correct answer to the question at the top of the page. The answers are included on each page. Some sample questions are: How do you make 11? Pick the one that does not make 2, Pick all the ones that make 19. The preview file has thumbnail shots of many of the pages in this file. This can be used in whole group, small group, or as a math center. All the pages have a mix of addition and subtraction.