I like ready to use centers. I created these number grids as a center that you can print, laminate, and then use immediately. No cutting out little pieces. No assembling. Just throw them in a file folder or envelope and you're ready to go! There are 20 different pages with a variety of numbers missing. The grids go up to 120 in order to meet the Common Core State Standards. Click on the pictures to come on over to get yours!