1. 1 Integers and the Number Line

2. 2 Constructing a Number Line A number line is drawn by choosing a starting position, usually 0, and marking off equal distance from that point

3. 3 Although only a portion of the number line is shown, the arrowheads indicate that the line and the set of numbers continue

4. 4 The set of numbers used on the number line is called the set of integers This set can be written {…, -3, -2, -1, 0, 1, 2, 3, …}

5. 5 The number line is made up of 3 sets of numbers Natural numbers 1, 2, 3, 4, … Whole numbers 0, 1, 3, 4, … Integers …, -2, -1, 0, 1, 2, …

6. 6 We can use a Venn Diagram to represent thee 3 sets of numbers and their relationship to one another

7. 7 You should not include the number 0 You should not include numbers less than 0 (negative numbers) You should not include the number 6 or any higher

8. 8 Positive numbers move to the right Negative numbers move to the left + 3 + (-8) = -5

9. 9 In Summary