It is crucial for students to discover the patterns in number grids. Many teachers work on this during calendar, but with calendar not officially in the Common Core standards, I know many people have removed it from their teaching.
It still needs to be practiced so I created 20 different pages that are ready to be printed and laminated for your centers.
I used a 120 chart to meet the Common Core standards. Click on the pictures to come over to my blog to grab yours!