High technology at your service. This is the world's first digital magic calculator that has been designed to work on your cell phone, PDA, or computer. An add-a-number effect that will blow your spectators minds.
Hand out a sealed envelope prediction to someone on the audience. Open your cell phone calculator, and have two spectators think of any random numbers. To "fuse" their toughts, they add the numbers on the calculator to get a result. That result will match your sealed prediction.
Ask some members of your audience to enter random numbers on the calculator while your back is turned, you guess the final result digit by digit. Pure. Mindreading.