Google Reusable Scratch Paper     
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          When solving Math or number problems you can use that particular educational toy as a scratch paper. I don't know how it is called but it is the one with a square thin transparent plastic or cellophane film on top. It has a pencil made of wood or plastic which is used for writing anything on this film. What is amusing about this toy is that, when you pull the cellophane film up and the other one next to it, all the writings are erased. This way you will no longer consume as much scratch paper as you normally do. You can use this toy repeatedly in solving Math problems and others, making you save money. In the future you can make use of custom made Google Perpetual Scratch Paper you can bring along at school and anywhere you need them. I hope this Google article is helpful to you.....