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seen Apr 19 at 22:56

Jul
2
awarded  Curious
Apr
19
awarded  Popular Question
Dec
7
comment Is there one method of adding and subtracting without a calculator?
Yes, but $80-(-70)$ would by my algorithm be interpreted as $80+70$ since, as I see it, this method cannot be applied without running a else/elseif for these four conditions: +A+B, +A-B (|A|>|B|?), -A+B, -A-B.
Dec
7
comment Is there one method of adding and subtracting without a calculator?
It probably is correct. I'm going to test my algorithms with a recursive fibonacci generator, so if the numbers are correct, the algorithms are probably correct as well.
Dec
7
comment Is there one method of adding and subtracting without a calculator?
Hmm... I've been calculating on a paper for a while now. As I see it, one can make a few rules. If you always do A-B. Given A-B where |A|>|B|. One can calculate with as many digits as the number with the most digits, and then neglect all the 1's in the answer to get the right answer.
Dec
7
comment Is there one method of adding and subtracting without a calculator?
This method is just fantastically smart and yet not logically difficult, at least not how you explained it!
Dec
7
awarded  Critic
Dec
6
comment Is there one method of adding and subtracting without a calculator?
Yes, that is true. I've searched the internet, but I haven't found anything that isn't compiled, obfuscated and embedded in much other code so I can't extract it. + It is copyrighted..
Dec
6
accepted Is there one method of adding and subtracting without a calculator?
Dec
6
comment Is there one method of adding and subtracting without a calculator?
Thanks for your response! Actually, I'm asking this question because I'm making a computer method that is simply going to add, subtract, multiply and divide numbers. I need it because the language I'm writing in thinks any number greater than $9007199254740992$ is infinite. Great answer!
Dec
6
comment Is there one method of adding and subtracting without a calculator?
I agree with you on the multiplication/division, but not on the addition/subtraction.
Dec
6
comment Is there one method of adding and subtracting without a calculator?
@ChrisEagle I'm not an english speaker, so I'm not very experienced with english mathematical terms.
Dec
6
comment Is there one method of adding and subtracting without a calculator?
@HenningMakholm Exactly! I've already thought about this solution, but it again brings us back to start as you Henning stated.
Dec
6
asked Is there one method of adding and subtracting without a calculator?
Sep
29
accepted Why does this equation have different number of answers?
Sep
28
comment Why does this equation have different number of answers?
Please add your comments as an answers, as it is more useful for other people that come from Google. :)
Sep
28
comment Why does this equation have different number of answers?
@GerryMyerson But if there are "traps" like this, how does one discover them when the problems get more complex than just the simple problem I wrote?
Sep
28
comment Why does this equation have different number of answers?
@PeterTamaroff and
Sep
28
comment Why does this equation have different number of answers?
@PeterTamaroff I feel really stupid right now... I was just too caught up trying to make it become $x=2x$...
Sep
28
comment Why does this equation have different number of answers?
But then you can do $\frac{1}{x} = \frac{2}{x} | \times x$ and get $2=1$.