Count to 5.

As someone who celebrates 100 days of school with her class every year. This is neat. I like the middle version of tally marks seems like a very simple way to group things in fives and tens in a more organized way. Probably handier to write out as well. I would much rather use the box method to write out 100. Lol

Very Interesting! The Chinese tally seems rather alien!

Americans can use a calculator

@4meAndyou There is actually a kind of a pattern. The successive strokes alternate between horizontal and vertical.