Introduction to the TI-84 Plus and TI-83 Plus Calculator
The TI-83 Plus, TI-83 Plus Silver Edition, TI-84 Plus, and TI-84 Plus Silver Edition have exactly the same keystrokes. The TI-83 Plus Silver Edition has more memory and is faster than the TI-83 Plus. The TI-84 Plus has three times the memory of the TI-83 Plus. The TI-84 Plus Silver Edition has nine times the memory of the TI-83 Plus and is two and one half times faster than the TI-83 Plus.
The TI-84 Plus family came on the market in the summer of 2004. All of the TI-84 Plus family have a built in USB port. Using the TI Connect Software, you may download images from the calculator to a computer. Students may also link the TI-84 Plus family of calculators to another calculator.
Some students will have the TI-83 calculator. Some keystrokes will be different from the TI-83 Plus especially in the FINANCE chapters. (See chapter 12 notes for accessing the FINANCE key on the TI-83.)
For more information on the TI-84 family of calculators, visit Texas Instruments home page for calculators at:
http://education.ti.com/educationportal/
Fraction Reference Sheet for TI-84 and TI-83 family of calculators
The TI- 84 and TI-83 family of calculators do not have the button on them. To enter a simple fraction or an improper fraction into the TI-84 or TI-83, use the key.
Example: To enter do the following:
2/3 should appear on the display screen.
If you enter without pressing, your answer will be displayed as a decimal. Even after the decimal appears on the screen, you may still press to see the fraction answer. You do not have to clear the screen and reenter the values.
To add, subtract, multiply, or divide simple fractions or improper fractions, enter each fraction as in the above example with the correct operation ( +, -, x, ) between the fractions. Put ( ) around the fractions. You do not have to get a common denominator for the addition or subtraction problems.
Example:
51216
You should see 1/4 on the display screen. Notice this answer is in reduced form. The TI-84 and TI-83 will always give the answer in reduced form.
Example:
2358
The display screen has 31/24 as the answer. Notice the answer is an improper fraction, not a mixed number. You will need to change the answer to a mixed number by hand (hint use division). The TI-84 and TI-83 will never display the answer as a mixed number.
= 31 24 = 1
Example:
58115
The display screen has 11/8 as the answer. You will need to change this answer to a mixed number by hand (hint use division). The TI-84 and TI-83 will never display the answer as a mixed number.
= 1
There are two ways that you can perform operations with mixed numbers on the TI-84 and TI-83 calculator.
Method I. Enter the mixed numbers as mixed numbers by using the fact that a mixed number is a whole number plus a simple fraction.
To enter a mixed number, put the whole number plus the simple fraction inside parenthesis.
To enter into the TI-84 and TI-83, do the following: 1423.
To add, subtract, multiply or divide mixed numbers, enter each mixed number as shown above with the operation sign between the numbers.
Example: 13
123312
35/6 is now displayed on the screen. You will need to change this number to a mixed number by hand (hint use division). The answer is 5.
Example:
51816911
1931/88 is now displayed on the screen. You will need to change this number to a mixed number by hand (hint use division). The answer is .
Method II. Before entering the numbers into the calculator, change the mixed numbers to improper fractions and enter the improper fractions into the calculator.
Example: 1
Change 1 to
Change 3 to
5372
35/6 is on the display. You will need to change this number to a mixed number by hand (hint use division). The answer is 5.
Example:
2
Change 2 to
Change 1 to
21854
21/10 is on the display. You will need to change this number to a mixed number by hand (hint use division). The answer is 2.
When the answers are “messy” improper fractions, the calculator can assist in changing the improper fraction into a mixed number. Enter the problem as before, but do not press. Just press. This will give the decimal equivalent to the answer. Then subtract the whole number part from this decimal value. Now press.
Example:
1481013137200= 5697/200
Instead just enter the mixed numbers and then press.
1481013137200. The decimal answer will appear. Answer: 28.485
Since 28 is the whole number part of the answer, subtract 28 when 28.485 is displayed on the screen. Then type . This will give 97/200.
The final answer is .
Warning: This method will not always work. Sometimes the calculator will not convert the decimal to a fraction, so you must still know how to change an improper fraction to a mixed number by hand!
Practice:
1.) 2.)
3.) 4.)
5.) 6.)
7.) 8)
9.) =
Answers to Practice:
1.) 78 + 19 7172
2.) 35 - 19 2245
3.) 112 x 25 130
4.) 25 ÷ 18 165 Student must divide to change the answer to a mixed number. = 315
5.) 15 + 58 + 14 4340 Student must divide to change the answer to a mixed number. = 1340
6.) 9+12 + 7+45 17310 Student must divide to change the answer to a mixed number. = 17310
7.) 34 x 200 = 150
8.) 9 - 5+38 = 298 Student must divide to change the answer to a mixed number. = 358
9.) 9+38 - 5 = 358 Student must divide to change the answer to a mixed number. = 438
Word Problems
1.) Pete Rowe bought a new hand-held computer at Circuit City for $399. The manufacturer offers a rebate of off the selling price. How much did Pete pay after the rebate?
2.) Brian Summers visited Gold’s Gym and lost pounds in week 1, pounds in week 2, and pound in week 3. What is the total weight loss for Brian?
3.) Lester bought a piece of property. The sides of the land measure feet, feet, feet, and feet. Calculate the perimeter of the property.
4.) A company bought 90 pizzas for their Fourth of July celebration. Each guest ate of a pizza. If there was no left over pizza, how many guest attended the celebration?
5.) Mobil allocates gallons of gas per month to Jerry’s Service Station. The first week, Jerry sold gallons; second week, gallons; and third week, gallons. If Jerry sells gallons in the fourth week, how close is Jerry to selling his allocation?