Integers and the Number Line

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Integers and the Number Line
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Constructing a Number Line

• A number line is drawn by choosing a starting
  position, usually 0, and marking off equal
  distance from that point

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

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• 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,

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• 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,

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

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• 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

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• Positive numbers move to the right
• Negative numbers move to the left
• 3 (-8) -5

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In Summary