Base 10 Number System Question

[jstnrgrs]

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It looks your original question has been answered so I'll throw a couple of more thoughts out there. It sounds like you may not be familiar with this, but all computer people think in Base-16. It is very useful to know. Wife permitting, I am personally going to teach my kids to think in Base-16 or Base-32 and learn the appropriate multiplication tables. This will undoubtedly make them more adept at arithmetic.

The bottleneck in doing arithmetic in your head is memory, and with Base-16, there's simply less to remember. Four-digit numbers are now 3-digit numbers.

http://en.wikipedia.org/wiki/Hexadecimal

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I think base-16 or base-32 would not be that useful since their only prime factor is 2. I would suggest base-12 (or if you're really ambitious, base-30)