maple classic™ 
tom lehrer is 90????
his song "new math" never made much sense to me because i'm pretty sure what he describes is the same way they teach us here (and i don't think our math education ever changed)
@squirrel "The New Math" was a thing that happened in USA in the 60s.
https://en.wikipedia.org/wiki/New_Math
@rainwarrior i know that, i just mean the example in tom lehrer's song made sense to me
or at least, i remember so, it was a long time ago since i heard the song
@squirrel Oh I guess there was kind of a change in the standard way to describe subtraction/borrowing, but that part actually stuck around (unlike teaching bases)?
@squirrel This version has an animation that kinda shows the difference:
https://www.youtube.com/watch?v=UIKGV2cTgqA
And on Wikipedia it's "Austrian" vs "American" method:
https://en.wikipedia.org/wiki/Subtraction#Austrian_method
@squirrel Like he makes a joke about "7 from 3" or "8 from 4" which is just about whether that carry (in the old "Austrian" method) gets stuck on the top or bottom; either way works.
@squirrel When I was a kid we were taught the "American" method of crossing out the number etc. but I remember some of the older teachers would use the other way sometimes.
@squirrel (I had totally forgotten about there being another way to do subtraction, was kind of fun to remember.)
(Also this indirectly gave me another memory of the Alf math game for DOS.)
@rainwarrior yeah i use the one Wikipedia calls American method
@squirrel I just listened to the song, had never heard it before.
I think the "new math" part is just the base 8 thing?