Click here to learn about Dave Moursund's free book on science and technology education for teaches and parents of K-8 children.
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A few weeks ago I was reading a book to one of my grandchildren who is in kindergarten. We came to a picture of a cartoon animal that had five spots on its front side. I suggested to my grandchild that the animal likely had spots on it back. I asked my grandchild how many total spots the animal had. He thought a little bit and decided that the animal had five spots on its front side and five spots on its back side. A little quick mental arithmetic and he produced an answer—11 spots. But, within a second, he said, no that is not right. A few more seconds and he produced the number 10 with some help from his fingers.