Draw the 3rd and 5th figures.
Can you see a pattern in the completed figures? Use this pattern to complete figures 3 and 5.
How many dots will there be in the 50th figure?
The number of dots can be found by multiplying the figure number by
and then adding . Do this with the figure number equal to . dots
Is there a figure that will have exactly
dots? If so, which figure is it?
Do the same process as above, but in reverse. Subtract
and then divide by . If you get a whole number, that is the figure number.
Use the eTool below to create the patterns for Fig. 3 and Fig. 5.
Click the link at right for the full version of the eTool: 3-20 HW eTool