In the video, a young child is seen holding a smartphone and using the calculator app to perform a calculation. The child types in the numbers 4, 2, 0, and 0 into the calculator and presses the plus button to add them together. The child then types in the number 2, 4, and presses the plus button again. Finally, the child types in the number 1, 0 and presses the plus button one last time. The child then looks at the screen and smiles.