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The purpose of the Number Rods is to visualize the quantities 1-10: to learn to count and to associate the names with the quantities. There are ten rods varying in length from 10 centimeters to 1 meter. Each rod is divided into sections equal to the shortest rod.
Control rods are used to moderate the Nuclear Flux of a reactor (http://en.wikipedia.org/wiki/Neutron_flux â ânumber of neutrons passing through an area over a span of timeâ) â The control rod absorbs more neutrons.