http://www.darcygregoire.com Wed, 12 Nov 2008 05:19:52 +0000 http://backend.userland.com/rss092 en This is just something that occured to me today; I haven’t yet had the time to really explore it. Once I do, I’m fairly certain that it’s range of use will expand however, for the time being, please note the limitation listed below. Technique for performing mental multiplication for larger numbers. This ... http://www.darcygregoire.com/2008/05/05/another-mental-math-technique/ Here’s a quick trick for mentally multiplying two numbers which are greater than or equal to 10 but less than 20. Let’s use 18 and 19 as an example. Add the second digit in one of the numbers to the other number. 18 + 9 = 27 Now, add a zero (mulitply by 10) 27 ... http://www.darcygregoire.com/2008/04/26/quick-multiplication-trick/ I have a spreadsheet that I’m working on with thousands and thousands of time values listed strictly in seconds that I need to have converted into an hh:mm:ss format. Now, if we were just working in Excel, that’s as easy as saying =A1 / (1440*60) where A1 holds the value ... http://www.darcygregoire.com/2007/10/24/convert-time-in-seocnds-ti-time-format/ Here’s something that I’ve just added to one of my sites, www.gogosuperfun.com, that some folks may find useful. It’s intended to stop people from hotlinking images and thus stealing your bandwidth. Basically, it just blocks any domain, other than your own, from accessing filetypes that you specify. mod_rewrite code: RewriteEngine on RewriteCond %{HTTP_REFERER} ... http://www.darcygregoire.com/2005/12/18/block-hotlinking-with-htaccess/