The student simply clicks and drags the number into the proper square. If they click on the question mark, a list of operations pops up so the student can select which one they want. Once they have the equation finished, they click the check button and it lets them know if their answer is correct.
For every correct answer, they get a certain number of points. I like this app because it provides great practice for students to become fluent using the order of operations. I believe all my math students from lowest to highest will be able to use this and all of them will be challenged to find the correct answer.