Various forms of the abacus have been and still are used in arithmetic teaching. From the late 1830s, many American schools purchased numeral frames. These demonstration devices had one or more wires ...

The abacus is a computing device on which arithmetic calculations are performed by sliding counters (beads, pebbles, or flat discs) along rods, wires or lines. The instrument may have originated in ...

The abacus hand method assigns different values for different fingers ... Using this method, you can calculate up to 99 with all ten fingers and use just a few fingers to represent other higher values ...

We teach children to visualise the abacus in their heads, then use their fingers to manipulate the imaginary beads" ...

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