TI-83 Worksheet Number Xx

TI-83 Worksheet Number 1 TI-83 Fundamentals

This worksheet describes the basic fundamentals of operation the TI-83. The first step is to turn the calculator on by pressing the first key on the bottom row of keys. When you turn it on, you are on the “home screen” where most calculations are done. To turn the calculator off, press the 2nd key which functions like a shift key in the computer key board. The 2nd key is gold and the by pressing it the labels for the keys are now the gold numbers above the keys, and not the descriptions on the keys. To finish turning the calculator off, press the bottom key in the first row that has the gold lettering above it “OFF.” If you leave the calculator on for several minutes without using it, it will automatically turn itself off. The first key in the second row is the ALPHA key and it is another shift key. The key is greenish blue color and after pressing it, the labels for all the other keys are the greenish blue colored labels above the keys. If the screen on the calculator is a little faded out, you can increase the contrast holding down the gold shift key and hitting the blue up arrow several times. The reduce contrast, hit the down arrow. If the contrast does not come up, you need new batteries. If you have acquired a used TI-83 it is a good idea to reset all of the calculator memory to the factory values. If you don’t do this, values left in various parts of the calculator will may interfere with your calculations, producing error messages. Reset Calculator Memory

Key Strokes Comment 2nd MEM Display: (The MEM key is the gold part of the 5th key in the next to last row.)

7 Display:

www.mikeshoreline.com 1/9/2018 WS 1 Page 1 of 6 ENTER (or 1) Display:

▼ ENTER Display:

ENTER You are on the home screen and it reads “Done” in the upper right corner CLEAR Clears the home screen

Setting the Calculator to Show Numbers to Three Decimal Places

Key Strokes Comment Mode Display: The second row is the setting for decimal places. “Float” means the calculator will display all decimals up do nine as needed. We want to change the setting so that it will always display numbers to three decimal places ▼ ► ►► ► ENTER Highlights 3 and selects it 2nd Quit Returns to the home screen. Use this command whenever you away from the home screen and want to return to it.

Basic Math Operations

7 Find the value of 5   8 3 Key Strokes Comment 5  7  3 8 ENTER Display:

www.mikeshoreline.com 1/9/2018 WS 1 Page 2 of 6 7 Let’s suppose that you copied down the wrong problem above, and that should have 3 7 been . You don’t have to reenter the whole expression, you can edit it. 6 Key Strokes Comment 2nd ENTER Display: The expression is displayed again in a form that can be edited just like a computer word processor. ◄ ◄ ◄ 6 ENTER Display

: CLEAR Clears the home page

Find the value of 6.12  5 4.2 18 Whenever the expression inside of a radical includes math operations, i.e. addition, subtraction, etc. we need to rewrite the expression with parentheses around the “stuff” under the radical sign. The calculator helps you to remember this by entering the left parenthesis sign along with the radical sign. Add the parentheses to your expression before entering it: 6.12  5 (4.2 18) .

Key Strokes Comment 6.1x 2  2nd ( 4.2 18) ENTER Display: The x 2 keystroke is the first key in the 5th row. The square root sign is the same key with the gold shift key. CLEAR Clears the home screen

Find the value of 12.53.2

Key Strokes Comment 12.5 3.2 ENTER Display: (The power key is the fifth key in the fourth row) Clear Clears the home screen.

www.mikeshoreline.com 1/9/2018 WS 1 Page 3 of 6 Find the value of 4 76 .

Key Strokes Comment 4 MATH Display:

5 Display:

76 ENTER Display:

CLEAR Clears home screen

3 Find the value of 54 8 Whenever an exponent includes math operations, the exponent must have parentheses around it for the TI-83 to calculate the value of the expression correctly. The adjusted 3  input is 54 8

Key Strokes Comment 54  (3  8) ENTER Display:

CLEAR Clears the home screen

16.3  75 Find the value of 14.1 22.5 Whenever a math operation appears in the numerator or denominator of a fraction, (16.3  75) parentheses must be placed around it. The adjusted input is (14.1 22.5) . Key Strokes Comment ( 16.3 + 75 )  ( 14.1 – 22.5) Display:

www.mikeshoreline.com 1/9/2018 WS 1 Page 4 of 6 3 12 5  4 7.3 1.53 Find the value of  8 3  (46.3 12.9) Whenever we have a complicated expression like this to evaluate we want to write down the input adjusted for the parentheses that have to be added, and then put the whole expression into the calculator in one operation. The adjusted input is: 3  12 5  4 7.3 1.53     8 3  (46.3 12.9) Key Strokes Comment (12  (3  5) + 4 ( 7.3 – 1.5  3))  (3 + Display: ( 46.3 – 12.9 )) + 8 ENTER

CLEAR Clears home screen

1 1 Find the value of the expression  and express the answer in the form of a fraction in 4 7 its lowest terms. The TI-83 will do math with fractions! Key Strokes Comment 1  4 + 1  7 ENTER Display:

MATH Display:

1 ENTER Display:

www.mikeshoreline.com 1/9/2018 WS 1 Page 5 of 6 Find the value of the expression 3.52 15 .

Key Strokes Comment ( 3.5  2 – 15 ) ENTER Display: The reason for the error message is that the expression under the square root sign is negative, so the expression is not a real number. It is a complex number. The TI- 83 will do math with complex numbers if set in complex mode. ENTER MODE Display: In the seventh row, “Real” is highlighted, so the calculator will not recognize the imaginary part of complex numbers. ▼ ▼ ▼ ▼ ▼ ▼ ► ENTER 2nd QUIT Highlights “a + bi”setting the calculator in complex number mode and returns to the home screen. When set in complex mode, the calculator still does math with real numbers correctly. 2nd ENTER ENTER Redisplays the problem. Calculates and displays the answer as the imaginary part of a complex number. In this case i= 1

Find the product of the two complex numbers 5  3i and 12  7i . Key Strokes Comment ( 5 – 3 2nd i ) x (12 + 7 2nd i ) ENTER Display: (The imaginary i is the gold case of the third key in the last row)

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