I learned this as a kid -- I think from a program in Cursor Magazine (distributed on cassette tape!) for the Commodore Pet. You can only count to 99, but it's a

I learned this as a kid -- I think from a program in Cursor Magazine (distributed on cassette tape!) for the Commodore Pet. You can only count to 99, but it's a little more practical for base 10 calculation: https://en.wikipedia.org/wiki/Chisanbop https://en.wikipedia.org/wiki/Chisanbop