How do u make these selections (Questions) shown at random?

Im currently in make of creating a math game that involves: addition, subtraction, multiplication and division. These parts with purple borders around them are the questions that i had created for the addition part when the user chooses to pick addition.

I dont know how to make these question be shown at random. When the user goes to select addition for addition questions everytime he does or goes back to do it again after he is done i want the questions not to be the same each time i want them to be in a different order. So its random each time. Screen shot of my questions i want to be put in random order.