These challenge cards were created as a way to differentiate my Common Core Math Meetings (found in my store). I cut out challenge cards 1-10 and put them on a ring. My fast finishers who perform consistently well on the Math Meetings and need a challenge grab a ring of challenge cards. If they finish a problem quickly during the Math Meeting, they can do the activity listed on the challenge card under the same number and write it next to their original answer. This is a wonderful way to keep all students engaged!