Historical Number Systems.
Math majors out there will show some interest in this one: English vocabulary gives us some hints on it’s historical number system. And, interestingly, this whole business of dividing things in terms of ten may not have been an original feature.
Number systems like the one in English are regarded as “Base-10,” where 10 is an especially meaningful unit. For example, the addition of ten turns “twenty-two” into “thirty-two,” and number prefixes (“twenty,” “thirty,” “forty”) are always increments of ten. Historically, however, it would appear that English was different.
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