# Foo - How do you do your subtraction?

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View Full Version : How do you do your subtraction?

jschen
06-02-07, 02:30 AM
Okay, following up on a question I asked over a year ago...

Just for amusement, let's try something. I am posting two numbers below. Try to subtract the second number from the first either in your head or on paper (no assistance from computer/calculator/abacus/counting beans/etc).

314.159
271.828

Which way did you work? Left to right, or right to left?

jschen
06-02-07, 02:34 AM

ms.gio
06-02-07, 03:37 AM

Thanks jschen for making me doing simple substraction at 3:45 am. To be honest, that was a little hard for me to do at this hour...and I used to be an engineering student. :rolleyes: Goodness, I need to get to bed.

Nicodemus
06-02-07, 04:56 AM
me3h. i go for ride now

bitingduck
06-02-07, 08:23 AM
L to R in my head, R to L on paper

polara426sh
06-02-07, 08:27 AM
pie

atomship47
06-02-07, 08:29 AM
i do it like all yahoos.....on my fingers and toes.

EJ123
06-02-07, 10:41 AM
Porcupine

chrisvu05
06-02-07, 11:06 AM
on a calculator:rolleyes:

CdCf
06-02-07, 11:20 AM
Actually, I don't really do it either way.

314.159 becomes 300, from which I subtract 272, making 28. I then add 14 (300->314) to 28 and get 42.

Next, I subtract 828 from 1000 to get 172 and add 159. That's 331.

Serendipper
06-02-07, 11:36 AM
I work right to left, adding remainders as I go.

atomship47
06-02-07, 11:38 AM
Porcupine

TREE!

jschen
06-02-07, 11:41 AM
Actually, I don't really do it either way.

314.159 becomes 300, from which I subtract 272, making 28. I then add 14 (300->314) to 28 and get 42.

Next, I subtract 828 from 1000 to get 172 and add 159. That's 331.