Calculation chain with room for 20-digit number Plastic balls, diameter 10 mm on a stretch cord When pulling the cord, the lightweight ball stop is lifted up. Chain length: 15 cm Balls in the 5th step. As is known, the arithmetic chain is a simple and classical learning aid. However, our chain is even more well thought out: The beads are threaded on an elastic cord. This has the advantage that when you pull the line, the lightweight locking device is lifted up and all pearls slide together. The calculation chain is also made of plastic balls in order to be even more robust. This is a great advantage when used in school. In this way, it can be used for several class generations. The materials of the toy comply with standard DIN EN71-3 and CPSIA. - The item is – in contrast to many other similar calculation chains – not manufactured here in the Far East, but made in Germany, and is from the first bead to the finished product made by amedium-sized family owned business in Hesse.
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