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32
Using the TI-73: A Guide for Teachers
Patterns
© 1998 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
Activity
Have students perform the steps unless otherwise
indicated.
1. Make each large marshmallow into a Martian head by
poking 2 toothpicks on it and adding 2 small
marshmallows to the tops of the toothpicks for
antennas.
2. Starting with one Martian head, make a T-chart to
show how many heads and how many antennas. An
example of the start of a T-chart follows.
# Martian
Heads
# Antennas
1
2
2
.
.
5
4
.
.
3. See if the students can see a pattern in their own 5
Martian heads. Ask: What if we were to count
antennas in the entire classroom? Is there a fast way
to count them up?
Students can use the @ key to try their fast rule.
Example If students decided the rule was to add
2 antennas each time, then they would
enter
- † (above the @ key)
\ Z - l
Y @ Z @ (and continue putting
in the number of Martian heads and
pressing @ until they get to 5)
See if this matches their T-charts. Students will
probably discover that for every marshmallow Martian
head, there are 2 times as many antennas.