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We have most of the MathStart books. They are simply fantastic! Mr. Murphy has a knack for simplifying the concept for little kids and the illustrations are very striking. We read a new one every week and read it once a day (an idea borrowed from a friend).The books also have some activities that go with the concept.
I am a preschool teacher and bought this book for our unit about the circus. Each page includes a shape (or shapes) found at the circus, and the children enjoyed finding and identifying them. I like including math concepts wherever and whenever possible, and books like this certainly help!