This blog post by Alex Belos discusses Todd Buchholz's idea to teach children to visualize numbers in a vertical zigzag pattern, which he calls the Math Arrow. The numbers start at 0 on the bottom, rise in a clockwise direction until 50, and then descend to 100 right by 0. Todd believes that arithmetical relationships between numbers are much more intuitive using the Math Arrow since every number on the left section has a complement in the same position on the right such that both numbers always add up to 100.


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