Editing Subitizing (section)

===Abacus===
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The hypothesized use of [[yupana]], an Inca counting system, placed up to five counters in connected trays for calculations.

In each place value, the Chinese [[abacus]] uses four or five beads to represent units, which are subitized, and one or two separate beads, which symbolize fives. This allows multi-digit operations such as carrying and borrowing to occur without subitizing beyond five.

European abacuses use ten beads in each register, but usually separate them into fives by color.