Nearpod is one of my favorite Apps. It's similar to Classflow but way easier to use and you don't have to enter student names. You can create a lesson or they have premade lessons available for purchase. You can start a live session where you control the pace of the lesson with your teacher iPad or you can send it as homework and they can do it at their own pace in stations and then send you their results.
You can click on a student sample and send it out to all students to see a good example or maybe a not so good example:
This is my library of lessons. I just click a lesson, they send me a simple code and I share it with the students.