This course covers the first chapter of CBSE Class 10 Mathematics - "Real Numbers". We start with the classification or types of numbers and then cover Euclid's division lemma and algorithm. We move on to cover Fundamental theorem of arithmetic and irrational numbers. Course ends with decimal expansion of rational numbers. I have tried making it as interesting as possible. In future more chapters will be added to this course and it will become a complete Class 10 Mathematics Course.