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This virtual manipulative challenges the learner to find the prime factors for a pair of numbers. The factors for each number are displayed in a tree diagram from which the student drags the factors to the appropriate areas of a Venn diagram. The Venn diagram offers a useful visual display showing unique factors and common factors for the original pair of numbers. Using the display, the learner must find the pair's least common multiple (LCM) and greatest common factor (GCF). Buttons allow users to check their answers and select new problems. Instructions for using the manipulative are included, along with information about factoring. The site also links to the NCTM standard for number and operations. Copyright 2005 Eisenhower National Clearinghouse
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