It does not matter if you are in USA or UK or anywhere else in the world. Math is one of the things all of us have together. We need it. And we need to understand it so we can use it correctly. And no. The calculator does not give you correct answer unless you know how to put in the problem. But some of us struggle with the math while other think it is easy. I am a teacher of Math with almost 25 years experience. Tell me what you need help with and I will help you. One time? Sure. Once a week for some months? No problem for me. Everyday untill end of term? No problem exept I don't like to work on weekends. So try it out. You might be pleased to learn that math is actually fun when you start to learn it properly