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Nasco's Integer Flash Cards - Multiplication and Division - TB22821: By Christine A. Koers BS MS.Practice basic mathematical functions using both positive and negative numbers. Set includes 48 integer flash cards and five challenge flash cards. One math problem per side. The answer can be found on the back of the card in the corner. Grade 5 and up.Cat/Page: 9009 701 Usage Categories: Arithmetic Resources Multiply / Divide Flash Cards Math About Nasco In 1941, Nasco got its start by filling a need for teaching aids that were not readily available from any other source. To this day, we are proud to carry on that tradition and serve customers throughout the United States and abroad with the products they need, the quality they expect, and unbeatable customer service, all at prices they appreciate.