• ADDITION SUBTRACTION EXERCISE TEST STAMP This product is designed as a learning tool that automatically generates various exercises and test questions related to addition and subtraction when an inked strip is passed over the paper. It can be used as a training tool to improve the addition and subtraction process skills by offering hundreds of practical opportunities to the user at various difficulty levels. This innovative cachet test, which makes the addition and subtraction process fun, will prepare hundreds of questions to be answered in seconds at the moment you want to solve. Be sure to watch the video of the product. Blue and white colors are available and will be sent in different colors. Package Contents 1 x Addition and Subtraction Exercise Test Stamp