When viewing a stock on Yahoo Finance:

http://uk.finance.yahoo.com/echarts?s=ASC.L#symbol=asc.l;range=1d;compare=;indicator=volume;charttype=area;crosshair=on;ohlcvalues=0;logscale=off;source=undefined;

...I see that the last days closing price is listed under the stock name (currently Asos's last closing price was 5,025.92). Next to it there's either green text showing the stock has gone up or red text showing the stock has gone down. At the moment the price has gone up so it looks like this (in green):

25.92(0.52%)

I want to know how the figure of 25.92 is worked out. Is it todays closing price minus yesterdays closing price? I've tried calculating this but my figure comes out nowhere near 25.92.