Just How Old is the Abacus? With its invention dating back to 2,700 BC, it's older than numbers! These days an abacus makes a great visual, hands-on way to explore early counting and arithmetic concepts.
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Made from high-quality plastic with a spring-loaded center, these playing card holders measure 3 1/4 inch wide at the base and expand to comfortably hold even the thickest cards. Each holder can fit approximately 10-12 narrow or wide-size cards.
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