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Big 7 Number Properties to memorize

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Manager
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Joined: 28 May 2009
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Big 7 Number Properties to memorize [#permalink] New post 16 Dec 2012, 20:50
I always seem to make some silly mistakes on Number Properties problems. So I created this chart containing the "Big 7" numbers, the number properties, IMHO, that one must check before proceeding to select an answer. Below is a screenshot of the notes that I made to remind myself of these rules (correct me if I screwed up on something), hope it helps you guys as well:

Image

As pointed our by jakelong1, I've added an attachment that adds a perspective to the above image, which hopefully should clear up any confusion:

Attachment:
big-7.png
big-7.png [ 415.34 KiB | Viewed 1037 times ]

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Last edited by megafan on 24 Dec 2012, 20:44, edited 1 time in total.
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Re: Big 7 Number Properties to memorize [#permalink] New post 24 Dec 2012, 20:26
Bro.. can you please explain this diagram first, because without any info I was able to deduce most, but not great in confidence so wanted to cross check whether I was right or not. It would be great if you could explain what exactly you are trying to do here
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Re: Big 7 Number Properties to memorize [#permalink] New post 24 Dec 2012, 20:41
jakelong1 wrote:
Bro.. can you please explain this diagram first, because without any info I was able to deduce most, but not great in confidence so wanted to cross check whether I was right or not. It would be great if you could explain what exactly you are trying to do here


Thanks for pointing out. I use it as my memory aid, and you are probably right that it wont make any sense without some information on how I came to this level of abstraction. I basically got this from "Chilli Hot GMAT", it's a great refresher, and also has a lot of practice problems. You can purchase it at Amazon, it also comes in Kindle format -- which is what I purchased. Anyway, here's the excerpt from the book that further explains the Big-7 numbers (I basically abstracted my memory aid above from the reasoning mentioned below):

Attachment:
big-7.png
big-7.png [ 415.34 KiB | Viewed 1036 times ]

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Re: Big 7 Number Properties to memorize   [#permalink] 24 Dec 2012, 20:41
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Big 7 Number Properties to memorize

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