There are 40 Common Core Math problems for First/Second Grade. Simply laminate the cards, put them on a ring and place the blank student answer sheets in a basket for a quick and easy center. Included are an answer key and a page of blank forms for the students to fill out.
I made several copies of these and some students like to race each other to finish them all correctly. It's always a plus when students want to repeat an activity, especially math! These cards also encourage my students to refer to our math wall for help when needed.