Chisanbop is a Korean method of finger counting and arithmetic that allows a user to perform calculations (addition, subtraction, multiplication, and division) using only their two hands. The name comes from the Korean words chi (finger), san (calculation), and bop (method) — literally "finger calculation method."
“Page one,” she said. “Your thumb is five. Your fingers are one. And no batteries required—ever.” The Complete Book Of Chisanbop Pdfdrive
The Complete Book of Chisanbop is the definitive guide to a unique Korean finger-counting system that turns your hands into a living abacus. Created in the 1940s by Sung Jin Pai Chisanbop is a Korean method of finger counting