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The abacus (plural abaci or abacuses), also called a counting frame, is a calculating tool that was in use in Europe, China and Russia, centuries before the adoption of the written Hindu–Arabic numeral system and is still used by merchants, traders and clerks in some parts of Eastern Europe, Russia, China and Africa.

The exact origin of the abacus is still unknown.

Today, abaci are often constructed as a bamboo frame with beads sliding on wires, but originally they were beans or stones moved in grooves in sand or on tablets of wood, stone, or metal.

Educational technology is defined by the Association for Educational Communications and Technology as "the study and ethical practice of facilitating learning and improving performance by creating, using, and managing appropriate technological processes and resources".

A tool is any physical item that can be used to achieve a goal, especially if the item is not consumed in the process.

Tool use by humans dates back millions of years, and other animals are also known to employ simple tools.

In contemporary education, mathematics education is the practice of teaching and learning mathematics, along with the associated scholarly research.

A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same quantity.

Any other value of that quantity can be expressed as a simple multiple of the unit of measurement.