# Knowing Numbers

## Properties of Real Numbers

### Word to the Wise

*"One aim of algebra is to provide a compact, symbolic description of the world."*

*- Robert Blitzer, mathematician*

**Terminology:**

**variable** - the unknown value (or number)

### Commutative Property of Numbers

Hello everyone!

Here is a simple but useful math fact.

One basic rule of math that is good for all to remember whether we are balancing our

checkbook or helping with math homework is how to *commute *numbers.

*Remember *: for any two * variables * (including 0),

** A + B = B + A**

* Translation:* If 1 + 2 = 3, then 2 +1 = 3

### Further Information

Blitzer, R. (2010). *Precalculus.* Upper Saddle River: Pearson.

Lial, M. L., Greenwell, R. N., & Ritchey, N. P. (2012). *Finite Mathematics.* Boston: Pearson.

*Johnicia Haynes, 2020*