The Complete Book of Chisanbop : Original Finger Calculation Method Paperback – January 1, 1981

I bought this years ago when I was working as a tutor, dealing with kids having math issues. This was very helpful and I use it today with my family.Long dry read at times though, but quite a bit can be glossed over. I believe the excess repetition may be useful for some (boring for me).Good buy. Glad I did.

I love this book. The pictures make it easy to learn. Thanks

Still need paper and pencil when you go to 3 digit problems.

No idea