This is the first lesson in the Number Systems Unit Lesson Plan for the new 8th Grade Common Core Number System Domain. This lesson is first lesson for Standard 1. This lesson teaches the real number system and classifying numbers within the real number system. Included in this download is the complete lesson plan, student handouts and teacher answer keys as well as in lesson assessment and four assessment items to be added to your formative bank. In addition, you may want to download the free companion Smart Board to save some time in your lesson preparation. I hope you find this useful.