figuring pot odds quickly

[pocket3s]

After the flop multiply your outs by 4. In this case 12 x 4 =48 percent. The 10-1 means that your putting in 1/11, roughly 10 percent, into the pot. So 48 > 10, so you should call. After the turn you multiply your number of outs by 2 to see what the chances are you will hit your flush.