I'm with you. Some open source app is all they need. However to answer your question: phone rules in classrooms vary enormously and the dedicated calculator is

I'm with you. Some open source app is all they need. However to answer your question: phone rules in classrooms vary enormously and the dedicated calculator is faster to interface when you're drilling problems in a homework setting I finished highschool in the (gasp) 20th century so the modern classroom is certainly something I've had to learn