3.02 Number lines

Lesson

Ideas

You should be able to plot positive whole numbers on a number line. Try this question first.

Plot 3 on the number line below.

Worked Solution

Create a strategy

Identify where the integer 3 is placed on the number line.

Apply the idea

On the number line, we can plot the point in the mark labeled with an 3.

Idea summary

We can plot an integer on the number line by drawing a point on the line above that integer.

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Graph the integer -5 on the number line.

Worked Solution

Create a strategy

Use the fact that each space on the number line represents an increase of 1 unit.

Apply the idea

Negative numbers are to the left of 0 on the number line.

To plot -5, start at 0 and jump back 5 places to the left.

Idea summary

Negative integers are to the left of zero on the number line, and positive integers are to the right of zero.

Investigate everyday situations that use integers. Locate and represent these numbers on a number line.