2010-02-17, 06:06 | Link #3481 |
Moving in circles
Join Date: Apr 2006
Location: Singapore
Age: 49
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You know, now that I've brought it up, how would you illustrate the division by fractions to a 10-year-old?
I just realised that, even today, I can't think of an easy way to show what's going on behind the arithmetic. |
2010-02-17, 06:25 | Link #3482 | |
NYAAAAHAAANNNNN~
Join Date: Nov 2007
Age: 35
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Quote:
Show him what happens when 1/4 is divided by 1/2. The general arithmetic formula is [1/4] / [1/2] = [1/4] x [2/1] = 2/4 = 1/2 Use the analogy of 2 similar pies being cut into 4 parts and 2 parts respectively, and how many half-sized parts, can fit into a quarter sized pie? Answer : A half-size of the half size. Always keep in mind that the concept behind division is : X divided by Y = How many parts of of Y can fit into X? I remember being the one explaining it to my Primary school teacher and had my parents being called up for disrupting the class. Well, I read it from a book about shortcuts to complex arithmetic, with tricks like how to multiply 3 digit numbers by 3 digit numbers, back when I was very young, about 5 or 6. The books that you read when you in your toddler years tend to stick in your memory for a bloody long time, because it is at the very bottom of your memory bank. It is pretty amazing that after 16 years, I still can remember the technique for multiplying 3 digit numbers by 3 digit numbers, and the first 41 digits of pi, but I can't remember how to do college-maths level trigonometry.
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2010-02-17, 13:32 | Link #3483 |
Obey the Darkly Cute ...
Author
Join Date: Dec 2005
Location: On the whole, I'd rather be in Kyoto ...
Age: 66
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There USED to be a club in most schools in the US called "Number Sense" where they ran teams to compete against other schools. They'd learn a slew of math tricks to rapidly solve equations and engage in contests. My wife was a member when we were in high school.
That was before the Great Dumbing Down of Society though.....
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2010-02-17, 17:09 | Link #3484 | |
NYAAAAHAAANNNNN~
Join Date: Nov 2007
Age: 35
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We'd be drilled in the same old question types over and over again until it becomes automatic response. But most of us still don't understand how the underlying concepts actually worked, other than the kids who played around with the equations at home during their free time.
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2010-02-18, 19:35 | Link #3485 |
Procrastinator
Join Date: Mar 2008
Location: United States
Age: 36
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I don't really want to start a new thread in the tech support section of the website with my question. So I am asking here. If nobody knows the answer than it's no big deal.
What is the best method or settings to compress files using 7z or winrar? I am compressing and backing up files for a reformat I will be doing later today or tomorrow to replace my windows 7 RC1 operating system with a retail version of windows 7. it's about 200gb worth of material. pictures, video, music, games etc. i am only seeing a 95% compression ratio at the moment and I am hoping to get that a little lower.
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2010-02-18, 22:36 | Link #3486 | |
9wiki
Scanlator
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The issue here is that all your pictures, video, music, and games are, for the most part, already highly compressed. Much of the storage savings you get at that point is simply data contained in fewer total files and therefore potentially a few bytes are saved per file due to filesystem inefficiency. So, the short answer is that, unfortunately, you aren't really going to get it appreciably smaller than you have now. And it's going to take a loooong time to squeeze any significant savings out. In the time you'd wait on compressing/decompressing the data, you could have earned enough working a part-time job to buy a spare hard drive.
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2010-02-19, 06:20 | Link #3487 | |
sleepyhead
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Join Date: Dec 2005
Location: event horizon
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The archiving feature I use the most is store, just because archives are so much easier to move around then having 232 files copied (eww!).
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2010-02-21, 04:40 | Link #3489 | |
(。☉౪ ⊙。)
Author
Join Date: Jul 2004
Location: In Maya world, where all is 3D and everything crashes
Age: 36
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2010-02-21, 14:51 | Link #3490 |
Procrastinator
Join Date: Mar 2008
Location: United States
Age: 36
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thanks for the help concerning compression. It makes sense now. i knew pictures and videos were already compressed but it never occurred to me while trying to back up my files.
I ultimately decided to delete all but roughly 40 gigs of my data and stick it onto my Ipod...only thing i got that i can use as an external hard drive lol. it would have taken me 9-12 hours to finish the compression of 200gigs of data. then probably a few days to place all the data onto...50 dvds... It took an hour just to transfer 40 gigs of information from my hard drives to my Ipod.
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2010-02-22, 06:57 | Link #3494 | |
Just call me Ojisan
Join Date: Jan 2003
Location: U.K. Hampshire
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Quote:
Are you sure you are not mixing up the following two options? Find all posts by ... Find all threads started by ... Those two are available from the user's profile. The option "Find More Posts by ..." is the one available in the drop-down menu (when you click on the poster's user name within a post). Or are you saying that you no longer can see this option in the drop-down menu? |
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2010-02-22, 10:25 | Link #3495 | |
Banned
Join Date: Jan 2010
Location: gates of hell are opened before him.
Age: 35
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2010-02-22, 12:07 | Link #3496 | |
Junior Member
Join Date: Dec 2005
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2010-02-25, 05:08 | Link #3497 |
Desensitized
Join Date: May 2009
Location: LV-426
Age: 37
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What is (if there is one) the term for when people accidentally swap words around in a sentence? Or when they swap the starting letters of a word?
Eg. "I fan pretty rast." (I ran pretty fast.) or "One drop of world could cover the water." (Awesome quote from non other than Kent Hovind, who wanted to say the still horribly wrong "One drop of water could cover the world... if you spread it real thin.") I was just wondering since I was reading about Lord Rugdumph (an Orc who uses malapropisms in Oblivion) on the uesp wiki site.
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Last edited by Woopzilla; 2010-02-25 at 05:42. |
2010-02-25, 05:21 | Link #3498 | |
9wiki
Scanlator
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I'm not unfamiliar with the phenomenon. I tend to get a little lysdexic when I'm tired.
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2010-02-25, 06:04 | Link #3500 | |
Senior Member
Join Date: Mar 2003
Location: China
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problem, q&a, serious |
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