This article shows you a handy way to assess how much your gold is worth, using fractions.  If you had trouble with fractions in school (or never learned them to start with!), don’t worry: you’ll get step-by-step guidance, with examples!  Not only that, but it shows you how to work out approximate values in your head, without the need for a calculator.

http://hubpages.com/hub/How-to-multiply-fractionsand-scrap-gold-prices