Math WindowsThe perfect way to practice math skills. Reusable write-on/wipe-away cards can be used with dry erase markers or crayons. Larger "window" offers plenty of space for writing answer. Cards provide answers on the back for self checking. Great for centers or individual work. Three-hole punched. Includes five cards covering subtraction facts 0-12 and mixed review. Games/Manipulatives Type: Math Learning Games; Age Recommendation: Grades 1-5; Number of Cards: 5.