Ever try casting out 9's?
I remember that vaguely.
But I know for a fact that it wasn't until last year that I was exposed to a fascinating and useful concept: digital root!
> New math was great (for those continuing in math and science).
SMSG math was utterly confusing.
> Ever try casting out 9's?
Check digits. That's not math...it's magic :)
He's out to get you swervie...
***Ever try casting out 9's?***
Oh, heck, we did casting out nines in highschool math in the 1940s. I learned to do it, but I've always wondered what good it did. I add by tens instead. Care to explain?
Ever try casting out 9's?
Well, once in prehistoric times, I was taking a computer science class in assembly language, and we worked almost exlusively in octal... Before I realized it, I had began balancing my checkbook in octal, and it caused me some problems... The funny thing was that there was about 2 month period when none of the checks I wrote had 8s or 9s, so it just "happened," and I didn't notice!
Mark
"Ever try casting out 9's?"
I recall a very interesting Art Bell show where some math guy broke evrything down into one number - a nine i thought. I think it went something like:
8+7=15=87-15=72=7+2=9
12+32=44=1232-44=1188=1+1+8+8=18=1+8=9
657+36724=37381=65736724-37381=65699343=6+5+...= 45=4+5=9
YES! I believe this is it, although I thought he did it for subtraction too but I can't get it to work. So - why/how does this work?
Yes, but it turned out that my holy water was corrupted and I was holding my symbol the wrong way...
I laughed everytime someone said they took some “new math” teaching style. Because the second they take a REAL math course in college, and it doesn’t matter if it bonehead Math 91 (intro),the Prof or TA would drag them back to the tried and true methods developed throughout math history...