What is exponents and what does it mean? How do we write exponents? This mathematics lesson, Introduction to exponents and powers, for Grades 7, 8 and 9 will help you if you struggle with these questions. If you answered yes to any of these questions, then you should definitely watch this video! Not only will you have a better picture of what it means, but you will also understand what square roots and cube roots are. Remember: it’s all about the base!