![]() You can count numbers by pushing beads into the farthest up position. All beads begin in the lowest position stacked at the bottom of the abacus. Every rod represents a place value, with hundred thousands on the far left, ten thousands next, thousands, hundreds, tens, and ones on the far right. A standard Chinese abacus has six rods, an upper deck with two beads on each rod, and a lower deck with five beads on each rod. The way you use an abacus to calculate depends on the style and design of the tool. History of Computers: From Abacus to Smartphones (PDF). ![]() This device features both an upper and a lower deck with rods and beads, and was called a "suanpan." Some historians hypothesize that the original abacus was invented in China thousands of years ago, around 500 B.C.E. The abacus, on the other hand, featured rods, and could have been made out of stone, metal, or wood. The predecessor to the modern abacus was the counting board, which featured groves or lines between which pebbles or beads were moved.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |