The Checker Board is used for short and long multiplication with the hierarchies in the decimal system up to 100,000,000.
LCM85 紅，藍，綠格板 Checker Board
NT$4,400.00 NT$3,000.00
Sale!
LCM85 紅，藍，綠格板 Checker Board
NT$4,400.00 NT$3,000.00
