**Technology objective: **Students will explore patterns using the exponent
keys on both the TI-34 and the TI-81 calculators.

**Lesson:** Students should already be familiar with using the exponents
keys on the TI-34. (They can refer back to their "lab" worksheets if they have
forgotten.) On the TI-81 calculator, the students will need to look for the
"^" key. They will insert this symbol in between the base and the power. Have them try a few problems on their own.

Now have students look for the key marked 10 . First, ask them how to access it. Then have the students "explore" the key. After a few minutes ask them to describe what they think the function of that key is in their journals.

**Reinforcement: **

*Game 1*...
This activity was found in the 1992 yearbook
** Calculators in Mathematics Education ** from the

*Game 2*...
This activity was also found in the same article mentioned
above. The purpose of the game is to involve the students exploring the use of
exponents - positive and negative!

*Space Invaders*

1) Clear the calculator display.

2) Enter the following number: 63418275. These eight digits are the "space invaders." In order to protect planet Earth, you must shoot them down one by one by changing each digit to 0.

3) Digits must be shot down in ascending order. That is, you must first eliminate the 1, then the 2, then the 3, and so on.

4) For each digit in turn, record a keystroke sequence below that includes 10 . Then carry out the keystroke sequence.

5) If the correct digit is removed, proceed to the next digit. If not, reenter the previous display and try again.

Digit...................Keystroke Sequence...................Number in Display

1

2

3

4

5

6

7

8