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The abacus (plural abaci) was a digital calculator that was used to perform mathematical calculation especially for [[accounting|accountancy]] in [[medieval]] times. It works by having numbers represented by beads sliding on a rod. With it, the user can add, subtract, multiply, divide, and extract [[square root|square roots]].  Today even though it is obsolete it is still widely used in [[Asia]], particularly in the [[People's Republic of China]] and the [[Republic of China]].

The abacus (plural abaci) was a digital calculator that was used to perform mathematical calculation especially for [[accounting|accountancy]] in [[medieval]] times. It works by having numbers represented by beads sliding on a rod. With it, the user can add, subtract, multiply, divide, and extract [[square root|square roots]].  Today even though it is obsolete it is still widely used in [[Asia]], particularly in the [[People's Republic of China]] and the [[Republic of China]].