The+Abacus-+Julia+Telischi

= The Abacus =

The abacus is a device used for addition, subtraction, multiplication, and division. There are five beads on the lower deck that each have a value of one. The two beads on the upper deck each have a value of five. Therefore, each colomb can a value of up to ten. To count a bead, it is moved toward the beam. The columb farthest to the right represents the ones place, the columb to the left of that represents the tens place, etc. For example, the abacus on the right says 27,291.