MathTrix is a fun app for Mathematical Tricks. Now it’s free!!!
The classic math tricks from your childhood but in new astonishing presentation. You are bound to be amazed.
Ask your friend to take or think of a number and not to tell you. Then from this app show him or her the 6 cards and just ask him/her to confirm whether the card contains the number or not. If it contains press YES and does not contain press NO. Thus finishing six cards, you can tell him/her the secret number from the final screen.