Sometimes, just sometimes, you want to show off your addition skills. It’s at times like these that a list of doubled numbers comes in handy. It allows you to add up a huge list of numbers to really bend your audienceâs mind. Itâs easier than youâd think, too besuchen sie diesen link! This one page cheat sheet will give you the instructions to do it quickly. Confidence comes with just a little practise with this party trick.