This printable set of 32 cards gives students an opportunity to use critical thinking skills in determining the missing number on the number line. Count by ones, twos, fives, tens, fifty, and hundreds to solve. Answer key included. Great for small group, whole group, partner work, or even independent centers. Great review for older intermediate students and challenging for younger students. These are the same set of cards that are included in the Number Line Smartboard Lesson with Printable Cards.