1. EXAMPLE 3 Classify numbers
Tell whether each of the following numbers is a real number, a rational number, an irrational number, an integer, or a whole number: , , –  24 81
100 No
Yes
Real Number?
Whole Number?
Integer?
Irrational Number?
Rational Number?
Number  24
100
–  81

2. EXAMPLE 4
Graph and order real numbers ,
Order the numbers from least to greatest: 4 3 –  5 13
–2.5 9 .
SOLUTION
Begin by graphing the numbers on a number line. 4 3
ANSWER
Read the numbers from left to right:
–2.5, –  5 9 13 . ,

3. EXAMPLE 4
GUIDED PRACTICE
Graph and order real numbers
for Examples 3 and 4
Tell whether each of the following numbers is a real number, a rational number, an irrational number, an integer, or a whole number: , 5.2, 0, , 4.1,
Then order the numbers from least to greatest. 9.  7 9 2 –
–  20 9 2 – ,  7 20
4.1
5.2.
ANSWER

4. Graph and order real numbers for Examples 3 and 4
GUIDED PRACTICE
Graph and order real numbers
for Examples 3 and 4 No
Yes
Real Number?
Whole Number?
Integer?
Irrational Number?
Rational Number?
Number  20 7 9 2
4.1 –
5.2