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**John E. Franklin****Member**- Registered: 2005-08-29
- Posts: 3,588

25.4 divided by 8 is within one-half

of a percent of the square-root of

ten. This is interesting to note, in

case you are a carpenter or mechanic

with poor math skills and can't

remember if you should divide or

multiply. Because if you start with

8th's of an inch or if you start with

millimeters, you can go either direction

by just multiplying or dividing by

the square-root of 10 on any

simple calculator. If the answer looks

too small in one case, you hit the

wrong button and now you are in

centimeters instead of millimeters.

This is because the reciprocal of the

square-root of ten looks the same

except the decimal point is moved

over. If you are going from millimeters

to inches and you press the wrong

multiply button instead of divide, then you

will end up close to 80ths of an inch, and

hopefully you will then either move over

the decimal place or do the problem

again by dividing instead.

I know this is very silly, but I had to

share something with you today!!!!

**igloo** **myrtilles** **fourmis**

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**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,015

That is really cool fact! What is the dimension of the inch actually defined?

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

The knowledge of some things as a function of age is a delta function.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,306

Hi John E. Franklin;

No it isn't silly. As always I liked it.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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