an other calculation trick

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How much is 2^43?
Easy. It is in the order of 8,000,000,000,000. (instantly answered)
How do I do this?

well, first a bit of recap on math.
we know that 2*2*2*2*2*2*2=2^7
so (2*2*2)*(2*2*2*2)=2^7
so 2^3 * 2^4 = 2^7.
Rule: when multiplying powers with the same base, the exponents are added together.

Back to 2^43. This is the same as 2^3 * 2^10 * 2^10 * 2^10 * 2^10.
Now 2^10 = 1024 or rounded 1000.
So for every "ten fold" I multiply by 1000.
We end up with 8 * 1000 * 1000 * 1000 * 1000.

OK, Fine, but where would I use this for?
Lets say i need to host 6,000 clients. What subnetmask do I need?
I have 1 times 1000 so it is between 10 and 20 hostbits. Furter more, 2^2 = 4 (which is not enough) and 2^3 = 8 (which is sufficient). So we need 13 hostbits. So we need a /19 network.

 

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So what else do you do for fun?

 

Well, math is one of my hobbies
The other are rockclimbing, my dogs, my wife, reading, drinking a few beers, smoking sigars.
The order of importance differs day by day.

 

Gotta be careful there...

Beers and rockclimbing don't mix.
Dogs and Math don't mix.
Wives and cigars don't mix.
Reading and rockclimbing don't mix, nor do dogs.
Beers and wife doesn't mix.
Dogs can't read.

Jeeez - don't know how you manage mate!

 

It's not as bad as you think.
Beer and sigars mix perfectly.
My wife buys my beer and sigars, so no problem there.
In rockclimbing the first thing you do is 'read the route' to know where the rests are,, where to speed up and where to jump in dispare. You even need math there to calculate howmany seconds you have left to live.
My dogs can not read jet, but they are trying to learn. I simply have to be faster with the mail than they are.

 

Math is my phobia and rockclimbing would also scare me to death. If I were to admit to my wife that she was only a hobby, I'd have one more thing to be in fear of my life about.

 

Ahh, that black eye was a picture of yourself?

 

I take it you know this poem by Rudyard Kipling ?
(from http://glenavalon.com/thebetrothed.html)
Just don't show it to your good lady!

 

I did not know the poem and my love for smoking does not go that far. In fact I quited smoking sigarettes for my wife and I only smoke when she has allready gone to bed.

 

Does she read this forum?

 

Nah...she couldn't care less...fortunately.

 

Hi Tinus ,

since you are interested in Maths.. have you come across VEDIC MATHS, its amazing for anyone who wants to do calculations very quickly.. basically its an ancient sutras which are translated and applied to everyday calculations.. specially with larger numbers, decimals, divisions etc and you can answer pretty much anything very very quickly...and its ideal for all those who are sitting for competitive exams like GMAT etc..

this will give you a bit of glimpsehttp://www.vedicmaths.org/Introduction/What%20is%20VM.asp

 

Lol i like the way you class your wife as a 'hobby'

 

i was thinking the same...

 

Yes, I know Vedic. I read a book or two on this matter. I can assure you it goes a lot further than what is there on the site.

 

Everything you do not do for work and have fun with is a hobby

 

Personally I have just glanced thorugh, but knowing how good it is....I have bought few books for my kids to practice the basic stuff...( I have left teaching part to my wife..) and it has made huge diffrence, knowing that they can do it quicker..

 

Most books stop after simple math (multiplication and division). The book I used also handles equations (up to the 6th grade), roots etc.
Sometimes I had to read a chapter several times to get the point.