When I was in the classroom, I loved creating anchor charts with my students. They were visible and easy to reference. We did this through questioning and class discussions, so my students felt more a part of the content.
I wanted to share a few examples that you might find helpful.
Classifying Numbers Diagram
Integers on a Number Line
If you are planning your number system unit and looking for a few more resources, here are the handy unit and activities that are a part of my sixth grade bundle.
Also, be sure to download my FREE number system interactive flip books here.