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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.
Hence we see that control rods tend to provide a mechanism wherein the immense nuclear energy can be tamed within reasonable limits and ensure safety and security of the reactor as well the outside environment.