What's the highest number you can count on your fingers? When I need to do something repeatedly for a large number of times, I use my thumb to count the joints

What's the highest number you can count on your fingers? When I need to do something repeatedly for a large number of times, I use my thumb to count the joints of my fingers, where the right hand is the "ones" and the left hand the "tens" column. In practice, I only go up to a hundred (ie. I use the first three fingers on each hand while counting - three on each finger, for 1-9), because decimal. But, the same system could get to 12x12 or 13x13. A really neat alternative is to count on your fingers using binary. The right thumb is 0, the pointer 2, the middle finger 4, the ring finger 8, etc. Amazingly, this gets you to over 1000 on your two hands, which is a really neat trick in the right setting. (Casually counting aloud off you fingers is great way to break the ice when you use binary - it is familiar but unexpected, dumb but smart.)