“古人留下一座桥,一边多来一边少。少的要比多的多,多的反比少的少。”这是一则谜语,你能猜出它的谜底吗?其实,它就是我们非常熟悉的珠算盘。今天,我们就来讲讲珠算盘的历史。算盘与珠算算盘多呈长方形,四周以木条为框,木框内排列着一串串数目相等的算珠,称之为“档”。同时用一道横梁将档上的珠子分隔为上下两部分,上端有两个珠子, “The ancients left a bridge, while more and less on one side. Less than more, less anti-less. ” This is a riddle, can you guess its answer? In fact, it is We are very familiar abacus. Today, let’s talk about abacus history. Abacus and abacus abacus mostly rectangular, surrounded by wood for the box, wooden box arranged in a string of equal number of beads, called “file.” At the same time with a cross beam will be divided into two parts of the upper and lower beads, the upper two beads,