Thursday, September 27, 2007

I love numbers!

I have always enjoyed working with numbers. I learnt the 9 times table when I was only about 8 (then that was considered advanced). My dad had taught how to do it using my fingers so there were no need for memory work.

Do you know that any number times 9 will give you a result, where when you sum up numbers it reults in, it will always add up to 9?

eg 4 x 9 = 36 where 3+6 =9
or 356 x 9 = 3204 where 3+2+0+4 = 9
or 421 x 9 = 3789 where 3+7+8+9 = 27 and 2+7 = 9
So when checking any multiple of 9, you know you are wrong if it does not finally add up to 9.

Here are more interesting things you can do with numbers:

Take a look:


1 x 8 + 1 = 9
12 x 8 + 2 = 98
123 x 8 + 3 = 987
1234 x 8 + 4 = 9876
12345 x 8 + 5 = 98765
123456 x 8 + 6 = 987654
1234567 x 8 + 7 = 9876543
12345678 x 8 + 8 = 98765432
123456789 x 8 + 9 = 987654321

1 x 9 + 2 = 11
12 x 9 + 3 = 111
123 x 9 + 4 = 1111
1234 x 9 + 5 = 11111
12345 x 9 + 6 = 111111
123456 x 9 + 7 = 1111111
1234567 x 9 + 8 = 11111111
12345678 x 9 + 9 = 111111111
123456789 x 9 +10= 1111111111

9 x 9 + 7 = 88
98 x 9 + 6 = 888
987 x 9 + 5 = 8888
9876 x 9 + 4 = 88888
98765 x 9 + 3 = 888888
987654 x 9 + 2 = 8888888
9876543 x 9 + 1 = 88888888
98765432 x 9 + 0 = 888888888

Brilliant, isn't it?

And look at this symmetry:

1 x 1 = 1
11 x 11 = 121
111 x 111 = 12321
1111 x 1111 = 1234321
11111 x 11111 = 123454321
111111 x 111111 = 12345654321
1111111 x 1111111 = 1234567654321
11111111 x 11111111 = 123456787654321
111111111 x 111111111= 12345678987654321

Now you know why I enjoy numbers??

9 comments:

Bkworm said...

Wow, this is amazing! I've never been good with numbers...better with words-lah :)

bp said...

You're so good with numbers, no wonder you went on to be an accountant. And a very good one, I'm sure! =)

Anonymous said...

WOW!! I wish I was as good!

Bkworm said...

let's have more fun...come over and do that tag I have for you....AND have a funderful weekend ahead. :D

Judy said...

Brilliant indeed! :)

tigerfish said...

Did you mention before you are an accountant?

stay-at-home mum said...

I mentioned I was a bean counter. I was a wacthdog but not a bloodhound!

NomadicMom said...

waliow... I headache liow...look at all these numbers!!!

Jonzz said...

Note to self: Do not read math after 3 am.... Augh!

OK will come back and stare at numbers after I am awake. LOL!