[antaresequity]

That's the way I've always done it.

Me too...
Works for multiplication too

454 x 356 =

400 x 300
50 x 50
4 x 6

=

12000 + 2500  + 24 = 14524

This is how both genius kids and autistic number crunchers do it.

I started doing it this way when I was a wee tot....has served me well

Blows people away too so its fun

PS: Nobody taught me this...it just made more sense

 

[Sacajaweau]

I find this method in historical surveying data, circa 1800.

[edsheppa]

That's very funny.

[supercat]

Works for multiplication too

Perhaps you should explain in more detail, since your example seems 147,100 short.

BTW, there is a cool trick to division I discovered, which is of limitted usefulness when doing maths by hand, but makes division fundamentally parallelizable. I wonder if PGP or other such programs use any such technique?

[TAdorno]

Please tell me this is a joke. I hope you're not a school teacher.

[Marie]

(slaps forehead...)

If you have any other tricks FReep me!!! (Homeschooling two.)