Classroom clickers of old
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The crossword solution for Classroom clickers of old is :
Classroom clickers of old :
: a device used for counting and calculating by sliding small balls or beads along rods or in grooves
The abacus (plural “abaci”) was used as a counting frame long before man had invented a numbering system. It is a remarkable invention, particularly when one notes that abaci are still widely used today across Africa and Asia.
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