Reinforce quick recall of beginning subtraction facts with or without Talking Hot Dots® Pen. Features double-sided flash cards that students can use on their own, with a buddy or in a group: turn cards over to self-check. Supports subtraction fact fluency for numbers 0-13. Package doubles as storage box for quick cleanup; easily send cards home with students who need extra practice. Works with Talking Hot Dots® Pen (sold separately), which provides audio and visual feedback that allows students to complete activities independently. Grades 1+. Each set includes 50 double-sided cards for 100 interactive math problems.