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US Patent Number: 5,868,577 Published by ETA 1998Grades 2-8 Factor Blocks are a set of rectangular prisms whose dimensions are single digit primes. Factor Blocks help teach a variety of topics such as prime numbers, the multiplication table, prime factorization, GCF and LCM, fractions, graphing linear relationships, length-area-volume, and solving algebraic equations. Factor Blocks - ETA (1998) - (to order call 1-800-445-5985) or go to ETA Online Catalog
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