Page 208 - Math Smart - 7

In this chapter
umber Sequences
Pupils should be able to:

• generate terms of an
integer sequence
• find a term given its 9.1.1 Number patterns and sequences
position in the sequence
• find simple term-to-term
Investigate!
rules

Micky drew the triangles shown to
form a pattern. How many lines
are there In Figure 13?

Figure 1 Figure? Figures
Understand the problem
Figure 1 has lines.
Figure 2 has lines.
Figure 3 has lines.
What about the number of lines in Figure 13?

Make a plan
Can you make a table to see the relationship between the figure
number and the number of lines?
Figure Number of lines

2
3
Look for a pattern in the number of lines in the figures.

3, 5, 7,...
Starting with 3 lines in Figure 1, we to find the number
of lines in the next figure.

Try it out
For Figure 13, how many lines do we need to add to the number of
lines in Figure 1?
So, the number of lines In Figure 13 = + x

Figure 13 has ines.

Look back
-»5&"
Is the pattern correct?
Did I multiply correctly?
Did I add the correct number to the number of lines in Figure 1?
How can i check that my answer for Figure 13 is correct?

Terms and Sequences
I