# Think! There is always an easier way

**URL:** <https://forum.artofmemory.com/t/think-there-is-always-an-easier-way/40436>\
**Category:** Mental Calculation, Mathematics, and Puzzles\
**Created:** [July 31, 2019, 9:58pm UTC](https://forum.artofmemory.com/t/think-there-is-always-an-easier-way/40436 "2019-07-31T21:58:55Z")\
**Posts on this page:** 1\
**Showing post:** 26

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**Author:** ![OldGrantonian](https://forum.artofmemory.com/user_avatar/forum.artofmemory.com/oldgrantonian/32/2492_2.png) [@OldGrantonian](https://forum.artofmemory.com/u/OldGrantonian)\
**Post date:** [August 8, 2019, 12:34pm UTC](https://forum.artofmemory.com/t/think-there-is-always-an-easier-way/40436/26 "2019-08-08T12:34:08Z")

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> [@Kinma](#):
>
> 253 X 368:

.  
Thanks for giving a lot of your time to give such a detailed description.

As I said before, all that stuff is really amazing.

I was googling for some terms that you mentioned, such as “criss-cross”, “9 proof”, and “11 proof”. I found one of your old posts here:

> [@Help choosing a system for mental math](https://forum.artofmemory.com/t/help-choosing-a-system-for-mental-math/32751):
>
> I apologize for what probably appears as a redundant thread. I actually did read through all the others, but there didn’t seem to be a consensus about which mental math system is best. I’m guessing this is because “best” really depends on what you’re hoping to achieve, so I’ll start there. I’m looking for a system that allows for rapid multiplication of large numbers (maybe up to 4 x 4) and computation of square roots (and perhaps other fractional powers), and I’d like to do this without lookin…

So, there’s even more info in that old post for anyone that’s interested.

Thanks.

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