You will need 9 cards : ace through 9 of any suit.
Make three piles :
1,6,8
2,4,9
3,5,7
Ask the participant to move the 3 piles as many times as he/she prefers.
Now ask participant to shuffle each pile as often as desired.
Turn over top card of each pile and write this number on a sheet of paper.
Follow this procedure three times (Watch the video)
Total these three numbers.
See the magic prediction.
Amazing!

Watch the video.