There’s no fraction key on the TI-84 Plus calculator, per se, but many fraction tools are built into this calculator. For starters, isn’t a fraction just division in disguise? So, pressing / between two numbers creates a fraction.
Texas Instruments TI-84 Plus Manual. Page 1 TI-83, TI-83 Plus, TI-84 Plus Guide Guide for Texas Instruments TI-83, TI-83 Plus. (Be certain that you remember to enclose both the numerator and denominator of the fraction in parentheses.) A graph drawn with is a starting point.
Setting the mode
Do you prefer fractions or decimals? Would you rather work with an improper fraction or a mixed number? There’s no right answer to these questions, but what would make you (or your teacher) happy? Changing the mode of your calculator forces the calculated answers into a form of your liking. Be careful; this is a big decision on your part!
Setting the mode not only affects calculations on the Home screen, but also the way lists and sequences are displayed.
Ti 84 Plus Instructions Pdf
To change the form of your calculated answers, press [MODE]. Use the arrow keys to scroll to the 11th line, ANSWERS. Here, there are three choices that affect how calculated answers are displayed:
AUTO: Choosing AUTO displays the answers in a similar format to the way the expressions are entered. If the expression contains a decimal, then you should expect the answer to be in decimal form. If the expression is entered in fraction form, then you should expect the answer to be expressed in fraction form. See the first screen.
DEC: The DEC mode forces the answers to be displayed as decimals. See the second screen.
FRAC — APPROX: When possible, the FRAC — APPROX mode displays answers as fractions. See the third screen.
There’s one more mode decision you need to make. What type of fraction do you prefer: improper fractions or mixed numbers? Press [MODE] and change the FRACTION TYPE to one of these two choices:
n/d: Fractions are displayed in simplified fraction form.
The numerator of a fraction must contain less than seven digits and the denominator of a fraction must not exceed 9999.
Un/d: When possible, fractions are displayed as a mixed number.
To avoid errors and potential problems, enter U, n, and d as integers with a maximum of three digits.
Converting fractions and decimals
There’s an easy way to convert a decimal to a fraction, regardless of the mode setting. You can access the Frac and Dec functions in the first two options in the Math menu. The Frac function displays an answer as a fraction.
Type the expression and press [MATH][ENTER][ENTER] to display the expression as a fraction. Press [MATH][ENTER][ENTER], and your answer is converted to a fraction. See the first screen. If your calculator can’t convert an expression to a fraction, it lets you know by redisplaying the decimal.
How do you convert an infinite repeating decimal into a fraction? Just type at least ten digits of the repeating decimal and press [MATH][ENTER][ENTER]. See the second screen.
The Dec function converts a fraction to a decimal. Enter the fraction and press [MATH][2][ENTER]. Of course, if you’re not thinking ahead and your answer is in fraction form, just press [MATH][2][ENTER] to display your answer as a decimal. An example is shown in the third screen.
Accessing shortcut menus
Did you know that there are four hidden shortcut menus on your calculator? The four menus are: FRAC (Fraction menu), FUNC (Function menu), MTRX (Matrix menu), and YVAR (Y-variables menu). To access the hidden FRAC menu, press [ALPHA][Y=]. See the first screen. Notice that after pressing [ALPHA], the keys at the top of your keypad become soft keys that activate on-screen menus.
The MTRX menu can only be accessed by pressing [ALPHA][ZOOM] to access the MTRX shortcut menu. However, the rest of the shortcut menus can also be accessed by standard menus. For example, the FRAC menu can also be accessed in two places in the MATH menu. Press
(at the bottom of the NUM menu) to find the FRAC menu in a standard menu. See the second and third screens.
Entering fractions and mixed numbers
Press [ALPHA][Y=] to access the FRAC menu. The first two options in the FRAC menu are easy-to-use fraction templates:
n/d: Enter fractions in the fraction template.
Un/d: Enter fractions in the mixed number template. See the first screen.
The next two options are used for conversion:
Converts a mixed number to an improper fraction, or an improper fraction to a mixed number. See the second screen.
Converts a fraction to a decimal, or vice versa. See the third screen.
Entering complex numbers in fractions
The n/d fraction template has its limitations. Complex numbers may not be used in the n/d fraction template. To enter the complex number, i, press [ALPHA][.]. Entering a complex number in the n/d fraction template produces an error message as seen in the first screen.
Don’t worry! You can enter complex numbers into fractions the old-fashioned way, using parentheses and the division key. Your calculator automatically simplifies fractions that contain a complex number in the denominator. See the second screen.
Entering complex fractions
Complex fractions are fractions that contain one or more fractions in the numerator or denominator. In other words, complex fractions have fractions inside of fractions. No problem. Complex fractions can easily be entered in your calculator by using the n/d fraction template multiple times in the same fraction.
Press [ALPHA][Y=] to access the n/d fraction template.
Selected Instructions
Your calculator manual is the best reference. It contains worked out examples and sample screen views, as well as a complete index of features and actions. A new manual, either hard copy or electronic version, is available from Texas Instruments. Most of the instructions also apply to the TI-83(Plus).
Calculator key strokes are shown in brown: ON Features that appear above the keys in blue have the complete key sequence in brackets: OFF [ 2nd ON ] Alpha characters (letters) appear in lime green above many keys. For example, to access the character 'A', press [ ALPHA MATH ]
Bompani 1000 bo 05267 user manual free. Turn calculator on: ON Turn calculator off: OFF [ 2nd ON ] Stop an ongoing process: ON All calculations are done on the home screen. Get to home screen: QUIT [ 2nd MODE ] 4+5 : 4 + 5 ENTER 52 : 5 x2 ENTER 54 : 5 ^ 4 ENTER Clear the home screen: CLEAR Some keys add an opening parenthesis, which you decide when to close. : 9 ) + 4 ENTER [ 2nd x2 9 ) + 4 ENTER ] The answer is 7. : 9 + 4 ) ENTER [ 2nd x2 9 + 4 ) ENTER ] The answer is 3.60555.. Darken (lighten) the display: repeatedly press 2nd up-arrow (down-arrow)
Menus
Move around: use the four arrow keys Select an item: press the number next to the item, or move the cursor there and press ENTER
Once you enter a function you can graph it, put values into a table, and do calculations with the function name. The keys to manipulate functions are at the top, just under the display window. Enter a function formula: Y= Example: to define the function y = 3x+2 as the function Y3 use the down arrow key to place the cursor next to Y3= and type as follows: 3 + 2 The key which produces the variable X in this example will produce other variables when the calculator is in different modes. Graph a function: GRAPH Adjust the graph window: WINDOW Turn the graph of a defined function off or on: Y= Place the cursor on the = sign, press ENTER Table of function values: TABLE [ 2nd GRAPH ] Adjust values shown by table: use the arrow keys to scroll up and down, or TBLSET [ 2nd WINDOW ] Access the function name Y3: VARS Y-VARS 1 3 The name will be printed at the last cursor position. Clear a function definition: Y= Place the cursor on the formula, press CLEAR
You can do some calculations from the graphing screen. Get a cursor to follow a graph: TRACE and use the right and left arrow keys. Watch the values at the bottom of the screen. Move the cursor among several functions on the screen: Use the up and down arrow keys. Zoom in: first TRACE and place the cursor where you want the center of the new graph to be. Press ZOOM 2 ENTER The same Zoom menu contains a zoom out feature, as well as useful standardized axes. Find x-intercept of graph: CALC 2 [ 2nd TRACE 2 ] You will be prompted for bounds and a guess, which you type on the number keypad and then press ENTER each time. The left bound should be to the left of a visible intercept, the right bound to the right, and the guess in between the two bounds. The (approximate) intercept appears at the bottom of the screen. There are other calculations on the CALC menu, including minimum, maximum, derivative, definite integral, and intersection of two graphs.
Matrices
Ti 84 Plus Silver Edition Manual
Access matrix names: MATRIX [ 2nd x-1 ] TI-83: MATRX Enter the matrix : MATRX, use the arrow keys to highlight EDIT, choose a name (A-I) and press the number for that name (1-9). The given matrix has 2 rows and 3 columns, so press 2 ENTER 3 ENTER. Then enter the numbers in order by row, pressing ENTER after each: 2 ENTER 3 ENTER 1 ENTER 4 ENTER 0 ENTER 5 ENTER. Do a matrix calculation: access the matrix name and press the corresponding number. Complete the calculation. Example: assume you called the above matrix A. To calculate 3A, press 3 * MATRX 1. The home screen now contains 3 * [A]. Press ENTER. Square matrices sometimes have inverses. To find B-1: MATRX 2 x-1 ENTER. Find the row-reduced echelon form of A: MATRX, highlight MATH, use the down arrow key to find rref( and press ENTER. Your home screen now says rref(. Fill in the matrix name A, close the parenthses, and evaluate: MATRX 1 ) ENTER. Do not confuse rref( with ref(. If a matrix is too large to fit completely on the home screen, use the arrow keys to see more columns or rows.
Get in sequence mode: MODE, use the arrows to highlight Seq, press ENTER. Check the formatting: FORMAT [ 2nd ZOOM ], use the arrows to highlight Time, press ENTER. Enter a closed-form sequence: Y= Example: to define the sequence an = 1/n, n ≥ 1 as the sequence u(n) use the down arrow key to place the cursor next to nMin= and type 1 Then place the cursor next to u(n)= and type 1 ÷ Enter a recursive sequence: Y= Example: to define the sequence a1 = 3, and an = nan-1, for n ≥ 2 as the sequence u(n), use the down arrow key to place the cursor next to nMin= and type 1 Place the cursor next to u(n)= and type * u [2nd 7] ( - 1 ) Place the cursor next to u(nMin)= and type 3. When you leave this line a pair of braces {} will automatically enclose the number 3. This sequence should read 3, 6, 18, 72, 360, .. . Table of sequence terms: Adjust table values first (below)! TABLE [ 2nd GRAPH ] Adjust values shown by table: TBLSET [ 2nd WINDOW ] Make sure TblStart = nMin and ΔTbl = 1. Graph sequence values: Adjust WINDOW as for functions, paying attention to extra parameters that must be entered. Then GRAPH. Access the sequence name u: 2nd 7. Other names are v and w, above 8 and 9. The name will be printed at the last cursor position. Clear a sequence definition: Y= Place the cursor on the formula, press CLEAR Enter a series: Y= Use u for the sequence of individual terms and v for the sequence of partial sums of u. Example: to enter the series , enter the following values: nMin = 1; u(n) = 1/n2; u(nMin) = {1}; v(n) = v(n-1)+u(n-1); v(nMin) = {0}. The nth partial sum will appear as v(n+1).
Texas Instruments Ti-84 Plus User Manual Fractions Calculator
Enter data in lists: STAT EDIT, Edit. Clear a list: STAT EDIT, Edit, use the up arrow to place the cursor on the list name, press CLEAR ENTER Warning! Pressing the DEL key instead of CLEAR will delete the list from the calculator. You can get it back with the INS key. See Insert a new list below. List name: there are six built-in lists, L1 through L6, and you can add more with your own names. To access the built-in list L1: L1 [ 2nd 1 ] Insert a new list:STAT EDIT, Edit, use the up arrow to place the cursor on a list name, then press INS [ 2nd DEL ] Type the name of a list: use the alpha character keys. The ALPHA key is locked down for you. Press ENTER The new list is placed just before the point where the cursor was. Make values in list L2 a function of the values in L1: STAT EDIT, Edit, use the up arrow to place the cursor on the L2 list name, type a formula using the variable L1, press ENTER Prepare to graph list values: STATPLOT [ 2nd Y= ] Press a plot number, move the cursor to On, and press ENTER Make sure the list names you want appear opposite Xlist: and Ylist: Set the WINDOW to view the values in the lists. Graph list values: GRAPH Both list graphs and function graphs can be turned on and off in the function menu: Y=See above.
To access the built-in list L1: L1 [ 2nd 1 ] To access the RESID list: LIST [ 2nd STAT ] 7 Calculate statistics from list L1: STAT CALC 1 ENTER Calculate statistics from list L2: STAT CALC 1 L2 ENTER Use the down and up arrows to scroll through all the statistics. Set up a statistical plot: STAT PLOT [ 2nd Y= ] Choose the plot number; there are three different stat plots. Select On and press ENTER Select the type of plot and press ENTER Types of plots: 1. scatter diagram; 3. histogram; 6. normal probability plot. Enter which list(s) to take the data from, and other requested information. Stat plots can be turned on and off from this menu, and also from the function menu Y= Sort a list in Ascending order: STAT EDIT, SortA( Enter the list name and press ENTER To see the list, go back to STAT EDIT, Edit Calculate a linear regression with x = L1 and y = L2: STAT CALC 4 ENTER Calculate a linear regression with x = L3 and y = L4: STAT CALC 4 ( L3 , L4 ) ENTER Show the values of r and r2 in a regression: Start from the home screen. Select DiagnosticOn from CATALOG: [2nd 0 ] Press ENTER twice. It should say DONE. Now every time you do a regression, r and r2 are displayed. Quadratic, Cubic, Exponential, Power, and other regressions are available on the STAT CALC menu. To access statistical distributions: DISTR [ 2nd VARS ] Example: if you want the probability that a sample from the standard normal distribution will be between z = -0.3 and z = 1.5, press DISTR 2 -0.3 , 1.5 ) ENTER Note the commas.
Complex Numbers and Fractions
Get in complex number mode: MODE then choose a+bi. Access i: i [ 2nd . ] (That's the decimal point.) Use i as you would use any number in a calculation. To convert the current number on the screen to a fraction: MATH Frac ENTER
Store the last number appearing on the home screen: STO A ENTER [ STO ALPHA MATH ENTER ] The number is now in storage location A. There are 27 different storage locations, one for each letter (!) Use a previously stored number from register A: A [ ALPHA MATH ] If you're in the home screen and not sure of the value in register A, you can 'recall' the value in A, giving you a chance to delete that part of the calculation and try again: RCL A ENTER [ 2nd STO ALPHA MATH ENTER ] Example: store the number 5 in register A. Then try both of these sequences:
Texas Instrument Ti 83 Plus Manual
3 + A ENTER [ 3 + ALPHA MATH ENTER ]
3 + RCL A ENTER ENTER [ 3 + 2nd STO ALPHA MATH ENTER ENTER ]
Mode
Only change these settings for special purposes. The usual settings are: Normal, Float, Radian (for calculus) or Degree (for noncalculus courses), Func, Connected, Sequential, Real, Full. Press MODE
Format
Only change these settings for special purposes. The usual settings are the first choices in each row:: RectGC, CoordOn, GridOff, AxesOn, LabelOff, ExprOn. In sequence mode (MODE Seq), the usual setting for the first row is Time. Press FORMAT [ 2nd ZOOM ]