Twelve-times tables

Victor

12x1=12
12x2=24
12x3=36
12x4=48
12x5=60
12x6=72
12x ...

I realise this is a little lower in the level of sophisitcation this board is used to.

I was talking to a chinese guy recently. School children there don't do twelve-times (and eleven-times) tables, quite probably because they don't have the same concept of a dozen or 12d in a shilling.

Will we be able to do away with the twelve-times tables with full metrification?

Goodshape

They do do? We do do too.

Or is it that they don't do?

Victor

ha-ha

Shrimp

lol.. i'm pretty sure they still do 12x tables.. the wonders of calculators

simu

I never did those in school (1980s) and we learned the metric system only. I thought that was typical.

Shrimp

well.. i was a lil after your time. :rolleyes: we had the Busy at maths books ...

simu

Yeah, we had "Busy at Maths" and "Figure It Out" too but it was all metric.

is_that_so

Yes they are still at it. Was tortured by a friend's child to "test" him about two years back :rolleyes:

Capt'n Midnight

why not go as far as 16 times tables - in hex too,
seriously 12 is a handy number as lots of things divide into it, so everyone gets a slice of the pie.

some would say that 12 times 12 is gross

Shrimp

12 times 12 = 144... always easy to remember really quick for some reason..

oh and you know the way the mind remembers better in 7's.. thats definatly true.. cos like when i was in like seniors.. i could do them the easiest.. :rolleyes:

smiles

12*12 is easy to remember, and time for a rant.

If you like learning just squares, then you can do any multiplication like this:

a * b = [(a + b)(a + b)]/4 - [(a - b)(a - b)]/4

Ala the Babylonians with their crazy maths.

<< Fio >>

is_that_so

smiles wrote:

12*12 is easy to remember, and time for a rant.

If you like learning just squares, then you can do any multiplication like this:

a * b = [(a + b)(a + b)]/4 - [(a - b)(a - b)]/4

Ala the Babylonians with their crazy maths.

<< Fio >>

You can alrite. Can't see it being a big hit amongst 9 years olds

Victor

is_that_so wrote:

Can't see it being a big hit amongst 9 years olds

Nor the 32 year olds.

Capt'n Midnight

smiles wrote:

If you like learning just squares, then you can do any multiplication like this:<< Fio >>

multipli-wha?
just use addin'

0+0+0+1=1 = 1 x 1
1+1+1+1=4 = 2 x 2
4+2+2+1=9 = 3 x 3
9+3+3+1=16 = 4 x4
.....
100+10+10+1 = 11 x 11

Hugh Hefner

And then we of course we move on to adding all the numbers between a and b. e.g. 1+2+3+4+5+6+....+98+99+100 = 101 x 50 = 5050

Capt'n Midnight

Anyone feel sorry for the teacher Master Büttner who set some primary school kids the task of adding all the numbers between one and a hundred to keep them busy. And then have young mister Gauss come back with the answer a few seconds later...

seamus

I think there should be a progression to hexadecimal math. Far superior. 200 years time, all math will be in hex. Brilliant.

ecksor

What's so superior about it? (I assume you just mean arithmetic).

cajun_tiger

i was weird loved both 5, 9 and 12 times tables i thought it was a good way of helping later on in school life to know them all

seamus

ecksor wrote:

What's so superior about it? (I assume you just mean arithmetic).

Slightly quicker calculation.

Em, that's about it.

Victor

seamus wrote:

I think there should be a progression to hexadecimal math. Far superior. 200 years time, all math will be in hex. Brilliant.

Binary is much better, with just your fingers and toes you can count to 2^20 (= 1048576, base 10). In hexadecimal you can only count to 14*

I much prefer octal.

*= 20 (base 10)