Take the Mystery Out of Math with This Essential Reference! Confused by coordinates? Perplexed by primes? Hoping to hear how many sides a hexagon has? With more than 400 entries on shapes, numbers, concepts, and calculations, this comprehensive volume contains everything kids need to know to get ahead in math.<br />A great choice for children and parents who need help with homework, and for test prep and meeting standards, too: Clear, simple definitions and working examples. Helpful images, diagrams, and charts. Fast search index and cross-references. Measurement charts and conversion tables.