1. ## 9 digit rounding

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

2. ## Re: 9 digit rounding

>commensurable by 6 and 7

<span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">I was so confused by the word "commensurable" I Googled the word and the answer popped up the solution to your puzzle</span hide> <img src=/S/blush.gif border=0 alt=blush width=15 height=15>

Still don't understand the question but the answer is:

<span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">473816952</span hide> <img src=/S/grin.gif border=0 alt=grin width=15 height=15>

3. ## Re: 9 digit rounding

<span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">Darn google...well done Jezza! <img src=/S/grin.gif border=0 alt=grin width=15 height=15>
I saw this on my Google home page...it ads a puzzle everyday...this one I thought would be a good one for the lounge!</span hide>

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