This lab is designed for you to become familiar with your calculators. We will be using several in this class. The TI-34 is small but has many capabilities. The more you know about it - the more confident you should feel. Let's get started! Work in groups of two.

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Type in a number, say 420, and press the

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Let's try some simple operations to warm up. We are going to work on some keys you already should know. Compute the following with your calculator and record the results. (This will be a breeze!)

1) 123, 456 + 789, 012 =

2) 80, 000 - 456 =

3) 123.45 x 918.63 =

4) 189 25.3 =

5) 6 0 =

6) 2 3 =

Check with your neighbors to see if your answers are the same. Look at number 5. What did you think the answer was going to be? Explain why you got the answer you did below, maybe using a

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Look at your answer for number 6, work that one out by hand below. Do you agree with the answer the calculator gives? Explain the difference between the answers.

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First, you and your partner should discuss below how you could use the calculator to answer the following:

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You are now going to learn how to add, subtract, multiply, and divide rational numbers. Look for a key labeled

shows calculator's screen (it doesn't look exactly like what you are used to):

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Now you should be able to add + . Record your results below. What do you think it means?

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Your answer was a

1 + 2

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Now that you are an expert at using the "fraction" key, try the following:

1) x =

2) =

3) x =

Check with your partner to see if you both agree with the answers. Can you explain below why you got the answer you did for problem 2? What about problem 3? Could you have answered problems 2 and 3 without using the fraction calculator? Answer below.

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First, enter 5 + 1 and press

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Next, enter 100 - 4 and press

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Write a brief statement below that describes how you can use the calculator to generate a pattern of numbers.

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Now see if you can continue the following patterns using the calculator.

1) 3, 5, 7, 9, ___, ___, ___, ___, ___, ___, ___, ___.

2) 246, 267, 288, 309, ____, ____, ____, ____, ____.

3) 1001, 991, 981, 971, ____, ____, ____, ____, ____.

We can also use the calculator to generate multiples. What is a multiple? Define it below.

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To generate all of the multiples of two we will start with zero and add two. (Remember that zero is a multiple of all numbers.) If you continue to press "=" you will get all the multiples of two. You should have 0, 2, 4, 6, 8, 10, etc... Now you can generate the multiples of the following numbers. (Remember to start with zero.)

1) Find the first ten multiples of 3.

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2) Find the first ten multiples of 7.

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3) Find the first ten multiples of 12.

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Round the following and check with your partner to see if you agree:

1) Round 123.456 to the nearest

2) Round 5.3481 to the nearest

3) Round 9.9999 to the nearest

4) Round 0.345 to the nearest

Did any of them give you problems? Which ones and why? Answer below.

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The calculator has the capability to round. However, the task is a bit complicated and you must still know how to round. It really comes in handy if your are going to be entering a lot of data that needs to all be rounded to a specific place value. Let us say we are working with our checkbook and want to round all of our answers to the hundredth place. Keep in mind that monetary amounts end in

We can "fix" the calculator to round by pressing the blue bar labeled "2nd." What appears on the screen when you press the blue bar? What do you think the function of the blue bar is?

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Now that you have pressed the blue bar, press the arrow key. (You should look above the arrow key and written in blue will be the word

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The one thing you will have to remember is that you will have to use the

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Watch what happens when you enter the following number. The calculator has been fixed to round all of the numbers you enter to the nearest hundredth place. Enter the following and record the results.

1) $12.033 rounded to the nearest

2) $12.875 rounded to the nearest

3) $ 0.999 rounded to the nearest

Now using what you have learned, see if you can have the calculator round to the nearest tenth place. Remember how many numbers are after the decimal place when you fix it to round. Round the following to the nearest tenth place.

1) 12.05 rounded to the nearest

2) 0.94 rounded to the nearest

3) 0.99 rounded to the nearest

Explain below how you and your partner would use the calculator to round numbers to the nearest whole number. Test your hypothesis to see if it works and explain the procedure below.

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Did you and your partner come up with more than one answer? We really have to have consistency, and if you and your partner came up with different answers than we do not. Try entering the problem in the calculator using the following keystrokes. Fill in the blanks.:

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Did you or your partner come up with that answer? Is that the right answer?

You will investigate one other way to enter the problem. Think about whether you will get the same answer before you enter it. Enter the following problem as follows:

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Which key sequence do you think gives you the "correct" answer? Can you explain why? Before you decide, you may want to think about order of operations. (remember

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Now try the following using your calculator:

1) 20 / 2 x 4 - 10 + 15 / 3 =

2) 17 - 3 / 2 + 6 x 3 =

1) 7 x 7 =

2) 25 x 25 =

That was easy. However you had to use four keystrokes to come up with an answer. Do you remember a shortcut way of representing n x n? You and your partner should be looking on the keyboard for the

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The other key with raise any number, y, to any power x. Write down the key you think that is below.

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To do problems #1 and #2 from above, you can use either key. However, if you are raising anything to the second power, it is much easier to use the

1) =

2) =

To raise any number to any power, you will need to use the

and finally press "=." You should get 2401. Create three exponent problems on your own and record the three problems you tried along with the answers below:

2)

3)

1) Press the blue bar labeled "2nd" and then the key marked EXP with the symbol above it. What shows up on the screen?

_____________________________________

2) Enter the number 25. Press the blue bar labeled "2nd" and then

press the "=" key with the % symbol above it. What shows up on

screen?

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3) Press the blue bar labeled "2nd" and then the "." key with the

symbol SCI above it. Now enter the number 36000 and press "=."

What shows up on the screen?

_____________________________________

4) Press the yellow bar labeled "mode" and then press the number 4.

(You should see the word HEX on it.) Now multiply 4589 by 3698.

What shows up on the screen?

_____________________________________

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That wasn't bad. However, there is a way to enter your salary into the calculator so that it is in its memory for a while. To do this you must look for the keys labeled

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**IMPORTANT**

Remember at the beginning it was discussed that we could use two keys to clear the computer screen. We are going to use the

Now that the number is stored, to recall that number you will have to press the

We can use that stored number to create a table of hours worked and money earned. To find out how much you will make enter the number of hours multiplied by the

EX) If you worked 5 hours: enter 5

press the

press the

press the

What did you get?__________

Now complete the following chart:

Congratulations, you are now an expert at using the TI-34 calculator. There are stillHours worked | money earned1 2 3 4 5 6 7 8 9 10 11 12 13 14