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His two books for children are superb collections of such problems. Like Goldilocks' third bed, they are neither too hard nor too soft, but just right. --MARTIN GARDNER, puzzle creator and author "This is a rich set of diverse mathematical problems that can enrich a math class, stimulate children to play with mathematical ideas, or give gifted children a chance to solve interesting problems that lie beyond the limits of most school mathematical curricula.".
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.