Numbers for Smart Kids by Betsy Wolff Frey (English) Paperback Book
20,85 €
By Betsy Wolff Frey. Betsy Wolff Frey is a software developer and author of books for children. She is delighted to be able to exercise both sides of her brain, using the logical left side for programming, web design, and, more recently, demystifying advanced subjects for students.
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