1. Közösség
2. General Khan Academy Questions
3. What is the difference between Arithmetic course and Arithmetic (all content) course and which one I should follow to learn arithmetic fully?

Thank you very much. I got it and I think the first two lines of your reply would have cleared the the doubts and had it been a short note at the beginning of the two courses. Adding an explanator...

1. Közösség
2. General Khan Academy Questions
3. Can't find Fractions in Pre-Algebra

Thank you. I've done it. Thanks for the link.