1. 1
Introduction to Algebra:
Integers

2. R.1 Fractions
1.2 Introduction to Signed Numbers
Objectives
Write positive and negative numbers used in everyday situations.
Graph signed numbers on a number line.
Use the < and > symbols to compare integers.
Find the absolute value of integers.

3. Write positive and negative numbers used in everyday situations.
Numbers greater than zero are called positive numbers.
Numbers less than zero are called negative numbers.

4. Write positive and negative numbers used in everyday situations.

5. Write positive and negative numbers used in everyday situations.
Positive numbers can be written two ways. 1. Write a positive sign in front of the number: +2 is positive Do not write any sign. For example, 16 is assumed to be positive 16.

6. Write positive and negative numbers used in everyday situations.
Example Write “a loss of $500” as a number with its appropriate sign.
– $500
negative sign

7. Graph signed numbers on a number line.
A number line is like a thermometer turned sideways.
Negative numbers
Positive numbers
Zero is neither positive nor negative.

8. Graph signed numbers on a number line.
Graph each number on the number line.
(a) –5 (b) 3 (c) 1 ½ (d) 0 (e) –1
Example
(a)
(e)
(d)
(c)
(b)

9. Use the < and > symbols to compare integers.
Integers are the numbers
…,6, 5, 4, 3, 2, 1, 0, 1, 2, 3 ,4, 5,…
“>” means greater than
“<“ means less than

10. Use the < and > symbols to compare integers.

11. Use the < and > symbols to compare integers.

12. Use the < and > symbols to compare integers.
Write < or > between each pair of numbers to make a true statement.
0 ____ 2
1 ____ 4
4 ____ 2
Example
0 < 2
1 > 4
4 < 2

13. Find the absolute value of integers.

14. Find the absolute value of integers.
Find each absolute value.
|4|
|4|
Example
4 spaces, so |4| = 4
4 spaces, so |4| = 4