Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ ¹ ² ³ °
 

You are not logged in. #1 20070810 20:30:52
SubtractionWhat do you think of this basic page on Subtraction ? "The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  Leon M. Lederman #2 20070810 22:03:54
Re: Subtractionany change of getting my method up there? i know other people have found it useful before: The Beginning Of All Things To End. The End Of All Things To Come. #3 20070810 22:38:30
Re: SubtractionIn school I learned the method shown on the site, but I've always used the method explained by luca.. #4 20070810 22:59:07
Re: SubtractionI prefer luca's method as well. The main problem with the one taught in schools is that it can need "double carrying". Why did the vector cross the road? It wanted to be normal. #5 20070811 09:58:20
Re: SubtractionCool. I will try to make a page on it, and you guys can then correct it. Code:32  15  Take tens complement of 15: 85 Code:32 + 85  117 Drop the "overflow" 1 to get the answer: 17 "The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  Leon M. Lederman #6 20070811 20:39:18
Re: SubtractionOoh, that's quite neat. Probably not the best 'core' method to use, but a nifty shortcut if you're subtracting something like 95. Why did the vector cross the road? It wanted to be normal. #7 20070812 11:37:25
Re: SubtractionOK, here is a draft of what I am calling Quick Subtraction "The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  Leon M. Lederman #8 20070812 20:36:37
Re: SubtractionI find using Quick Subtraction is just as fast as normal. #9 20070813 01:28:20
Re: Subtraction
Why did the vector cross the road? It wanted to be normal. #10 20070813 10:17:03
Re: SubtractionOh, yeah "The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  Leon M. Lederman #11 20070813 12:29:23
Re: Subtraction"2 is less than 6", not "2 less than 6" in sketchvid. igloo myrtilles fourmis #12 20070813 13:39:11
Re: SubtractionHmmm ... yes, could be confusing otherwise. "The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  Leon M. Lederman #13 20070815 17:25:00
Re: SubtractionI have been hard at work, and now have three methods described. "The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  Leon M. Lederman 