*This is part of my Unit 1 Interactive Notebook for Algebra 1. You can view the rest of it ***here***. *

## 1.1 – The Real Number System, Classifying Real Numbers & Closure

*There’s nothing trickier than picking the very first topic to cover in all of Algebra 1. So many options, so what goes first? *

To start the very first unit of Algebra 1 off, I begin by talking about the real number system and how we classify numbers.

*Why oh why, is this where I start*, you might ask?

Instilling this vocabulary is very important in helping students be able to hold fluent conversations about math. I can’t tell you how many students I’ve had in Algebra 2 (or Pre-Calc!) over the years that have asked “what’s an integer?” and they are unable to complete a problem that they otherwise would know how to do solely because they lack the basic vocabulary and don’t understand what the question is asking.

This is silly, and I want to prevent these things from happening as much as possible. **Math really is its own language**, and helping students learn it will allow them to be more confident and much more successful in the long run.