I'm talking about doing it in your head. 11 X 4334. So, with the other method, it would be 43340 + 4334. Not exactly the fastest way, unless you are really good at adding and keeping the numbers still in your head. But, with me method, it would be 4_ _ _4, some quick adding, 3+4, 3+3, 4+3, and that's 47674. Alot faster, I think.
Turn what you just did sideways.
43340
04334
--------
47674
It's hard for me to focus on the standard adding formuala when there at least 5 digits. Remember, I have to hold those numbers in my head. That's both set of numbers as well as the result I am calculating. On paper, heck yeah man that other method is awesome. And so is the method I was taught. I just timed myself and it took about the same amount of time on paper. But in my head, it's way faster for me to do my method. Again, that's only because adding involves trying to hold still 3 sets of numbers. And it's harder the more digits there are.
Formerly Mat Bloody Cauthon on Wotmania, blessed be its name
Does anybody know this math trick?
- 29/02/2012 07:29:58 PM
756 Views
Sure, it's an artifact of base 10
- 29/02/2012 08:24:18 PM
550 Views
Your own fault for doing lots of math. 
- 29/02/2012 08:37:39 PM
615 Views
- 29/02/2012 08:37:39 PM
615 Views
More my fault for having a algebra textbook that obsessed with abnormal base calculations
- 29/02/2012 09:19:15 PM
608 Views
Your method for 11 might be even quicker!
- 29/02/2012 08:46:44 PM
440 Views
That is wayyyyy more complicated than 10x+x. But if it works for you, I am happy. *NM*
- 01/03/2012 07:16:40 AM
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Not really
- 01/03/2012 04:24:20 PM
404 Views
That's, uh... the same thing.
- 01/03/2012 08:38:03 PM
379 Views
Again, it's the doing it in your head thing
- 01/03/2012 10:27:01 PM
500 Views