In the video, a person is using a calculator app on their phone to perform a calculation. The phone is placed on a marble countertop. The person types in the number 13, followed by the number 222222222. They then press the 'C' button, which clears the screen. Next, the person types in the number 4 and presses the '+' button. They then type in the number 52, followed by the number 888888888. Finally, they press the '=' button to get the result of the calculation.