#### Module 1 – Introduction and Review

### Section 1.1 – The Real Number System

The
Real Numbers include positive and negative counting numbers as well
as all their possible ratios (fractions), but that's not all. In order
to describe physical measurements we also need to consider
"irrational numbers".

In this section you will be reminded why these are necessary and how
such numbers all correspond to points on a "Number Line". You will also
review the basic arithmetic operations and some of their algebraic
properties.
### What to do

- Follow the link above to review why we need to include more than
just ratios of whole numbers if our number system is to be used for
physical measurements.

- Read through section 1.1 of the text. As you proceed,
use the questions in this
'Reading Guide' to confirm your
understanding, keep in mind your
Learning Objectives for this section, and when you have finished be
sure to follow the suggestions regarding Further Practice.
- When you feel that you are ready, go on to the next
section.

Go
To: Sec 1.0 Sec 1.1
Sec 1.2 Sec 1.3 Sec 1.4 Lab