Abacus, Soroban, そろばん, Suan Pan, 算盘, Chinese, Japanese

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Human: Abacus: Seven Digits, Two Versions, 90mm x 140mm, Chinese or Japanese, designed for easy assembly. The ancient calculator comes in various styles, still widely used in Asian cultures to help children build number sense or as a toy. It makes a nice-looking multi-wheeled toy car or a sound shaker like maracas! The Chinese abacus features seven beads on a vertical bar, while the Japanese version has five beads on a vertical bar. Each bead in the lower deck represents one unit when moved towards the center beam. Each bead in the upper deck represents five units when moved to the center beam. On the Japanese abacus, each bar can represent zero to nine units. By contrast, the Chinese abacus allows the representation of zero through 15 units on each bar, supporting calculation using the base-16 system. For the base-10 system, only two beads are used at the top and bottom. Users can choose their own place for the decimal point, depending on their specific needs. The abacus is a blend of concrete and abstract representations. Small parts can be hazardous to young children; educate them not to put small parts in their mouth and follow all safety procedures when working with children. Have fun making and playing on your abacus! If you like Android apps, my app is available at https://play.google.com/store/apps/details?id=appinventor.ai_moodle_bu.TouchAbacusforKids. References: https://en.wikipedia.org/wiki/Abacus Dilson, Jesse. (1968). The Abacus: The World's First Computing System: Where It Comes From, How It Works, and How to Use It to Perform Mathematical Feats Great and Small. New York, NY: St. Martin's Press.