1. 1.8 Number Systems Positive Numbers Negative Numbers Natural Numbers
Define the vocabulary words in your notes.
Positive Numbers
Negative Numbers
Natural Numbers
Integers
Rational Numbers
Square Root
Perfect Square
Irrational Numbers
Real Numbers

2. Categorizing Numbers Real Numbers Irrational Numbers Integers Whole #s
Natural #s

3. Name the set or sets of numbers to which each real number belongs
Real, Rational
Real, Rational, Integer, Whole, Natural
Real, Irrational

4. Closure Property: When you combine any two elements of a set using an arithmetic operation, the result is also included in the set.
Example #2: Determine whether each set of numbers is closed under the indicated operation.
A) whole numbers, multiplication
Yes
B) whole numbers, subtraction
No (could end up negative)

5. Graph: To draw, or plot, the points named by those numbers on a number line.
Coordinate: The number that corresponds to a point on a number line.
Open dot (circle) means “don’t include”
Closed (solid) dot (circle) means “do include”
Graph the set of number x > -2

6. Radicals Example #4 Find
Radical sign: Used to indicate a nonnegative or principal square root.
Example #4
Find

7. Homework Assignment #7
p even, 69-70