... Explain what these numbers mean please

www.tradesports.com

... btt

Say  you want to bet on the presidential election. You buy a future that has two results, a Kerry win and a Bush win. Once you have that, you sell the half you don't want on the market they have set up--say, you sell the Kerry win for 45 cents,  and keep the Bush win result for yourself.

After the election, tradesports pays a dollar to the people that hold the winning half. If Bush wins and you have that half of the future, you get a dollar. The Kerry futures holders get zero. So you wind up with 0.45 + 1.00 = 1.45.