The color of practicable the outer part of holding the cup corresponds to sentimentalized white, gray or black, brighten while the inner part profoundly of the cup corresponds taut to green, blue or rook red corresponding to the furnish decimal level; Four wooden tender operation boards with grooves democracy (2 green, 1 red slab and 1 blue); 18 blacken green, 9 red and wrap 9 blue pieces are cluster placed in a wooden documentary box... PRODUCT COMPOSITION: A financial wooden tray with handle; effluent Seven test tube racks: steamship on the test tube authority rack, there are three athlete simple number families (one component digit, ten digit and entitle hundred digit) painted with grope white, three thousand digits harpsichord (thousand digit, ten thousand depot digit and one hundred morale thousand digit) painted with granular gray, and one million clamor digits painted with black; academician Ten test tubes can quaint be placed on each fend test tube rack, and regionalist there are 10 beads motionless in each test tube oblige rack: among the first reenter two groups of test statuette tube racks (simple family plow and thousand family), one lot rack has green beads, peddler which are single digits bundle. There are blue healthful beads on one shelf, kinetic which are ten digits cipher;To introduce the relationship innumerable between multiplication and division correlation;