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OMG I just realized this.

tera- = 4 thousands | 4 = tetra-
peta = 5 thousands | 5 = penta-
exa = 6 thousands | 6 = hexa-
zetta = 7 thousands | 7 = septa-
yotta = 8 thousands | 8 = octa-

I’d memorized atto- to exa- from childhood but when the prefixes were extended to ±21 and ±24 I could not learn which was yocto-/yotta- and which was zepto-/zetta-. No longer!

@futzle This is confusing. By "thousands", do you mean "group of three places"?

E.g., 1 tera-stuff is 1,000,000,000,000 stuffs?

@vertigo I do. Tera- = Thousand thousand thousand thousand. Four “thousand”s.

@futzle OK, that's what I thought, but I wasn't positive about that. Thanks for the clarity. :)

Also, thanks for pointing out the associations between the numbering systems. That is helpful.

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