Texas Instruments TI-73VSC Teachers Guide - Page 37

32 Using the TI-73: A Guide for Teachers 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 1 2 . . 5 # Antennas 2 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. © 1998 TEXAS INSTRUMENTS INCORPORATED Patterns