Feb 1, 2022 · One of the easiest ways to input Sin^2 is to type in (Sin (x))2. If you are using a graphing calculator, here’s what you add – Sin (x)^2= (Sin (x))^2. Another way to input Sin^2 in a scientific calculator is to enter X > Press Sin > Press the Squared button. We understand the stress you must have gone through trying to figure out the ... See all = (Equal Sign) Press 2nd MATH Press Enter to get = (Equal Sign)Visit InfinityCalcs.comHow to locate the Greater Than or Equal To command on a TI 84 Plus CE.To do so, follow these steps: If necessary, press [2nd] [MODE] to enter the Home screen. Enter the number you want to store in a variable. You can store a number or an arithmetic expression. Press. The result of this action is shown in the first screen. Press [ALPHA] and press the key corresponding to the letter of the variable in which you ...It's designed more for high school math so you'll likely run into many limitations. Instead, I'd suggest looking into calculators with CAS such as the Nspire CX II CAS or the HP Prime G2. If you still decide to go for the TI-84 family, then I do suggest the CE unless you're on a tight budget. The better screen, significantly faster internals ...Type a 7 on the Home screen, then press 2nd [TEST] to display the TEST menu. This is the second function on the MATH key. Choice 5 on the menu is the “”less than”” symbol. Either press 5 or ENTER with the Down Arrow key to highlight the 5. After the 7.How do you get a TI 84 Plus to have a greater than sign?Aug 9, 2016 · Graphing Systems of Linear Inequalities on the TI 84 Plus CE Graphing Calculator.If you are thinking about joining the military, read my article about joinin... Press Enter, located in the bottom right corner of the calculator, to select the equal sign, which is the first option in the TEST menu. If you accidentally selected something else, use the arrow keys to navigate back to the equal sign option. This produces an equal sign in the operation or program you were working on. Tips Cite this ArticleTI-84 Plus CE CATALOG. This item accesses special characters and accent marks used in the language that you chose for localization. You can use these special characters and accent marks for display messages and text strings that you want to store to a variable. You cannot, however, use them in variable names. 1. Press y N to display the CATALOG.Is there an equal sign on TI-84? Press your calculator’s 2nd button, located in the top left corner, followed by the MATH/TEST button on the left side. Press Enter, located in the bottom right corner of the calculator, to select the equal sign, which is the first option in the TEST menu.Thousands of students come to Infinity Calcs to find information on TI 84 graphing calculator tutorials, games, programming and more. ... TI-84 Plus; TI-84 CE; TI-83 ... How to find any character on TI-84 Plus. * If you’re here looking for arrow symbol -> this can be typed out by pressing the “sto->” key right above the on button on your TI-84 Plus.*. The TI-84 has a bunch of different characters and functions that aren’t always easy to find.Jul 27, 2021 · The new TI-84 Plus CE Python graphing calculator includes familiar features like a full-color screen, lightweight design and a rechargeable battery that can last up to a month on a single charge. Unlike laptops and tablets, the TI-84 Plus CE Python graphing calculator does not have any distractions like Wi-Fi, Bluetooth or a camera, keeping ... VDOM DHTML tml>. Where is the = button on the TI-83 calculator? - Quora. This is a video in my TI-84 Plus CE Graphing Calculator Tutorial Series. In this video, I show you how to calculate the logarithm with any base on the TI-84 ...Apr 12, 2022 · The good news is that it’s actually very simple to do. You only need to remember simple mathematical rules. In order to calculate the 5th root of 100, just raise 100 to the 1/5th power. You can do this in the TI-84 Plus by typing: 100^ (1/5) ENTER. The 5th root of 100 is equal to 2.51189 in this example. Feb 1, 2022 · One of the easiest ways to input Sin^2 is to type in (Sin (x))2. If you are using a graphing calculator, here’s what you add – Sin (x)^2= (Sin (x))^2. Another way to input Sin^2 in a scientific calculator is to enter X > Press Sin > Press the Squared button. We understand the stress you must have gone through trying to figure out the ... :ClrHome Will clear any text that was on the home screen before the command was executed. On the TI-84, the Home Screen is the IO Screen. However, the TI-89 separates the two screens, so ClrIO will clear any program output, and ClrHome will only clear the Home Screen. PRGM I/O 8:ClrHome :prgmCLRHOME :Output(1,1,"1234567890123456 :Output(2,1,"7890123456789012 :Output(3,1,"3456789012345678 ...TI-84 Plus CE Graphing Calculator For Dummies, 3rd Edition. The Equation Solver on your TI-84 Plus calculator is a great tool for solving one-variable equations. The Solver is also capable of solving an equation for one variable given the values of the other variables. Keep in mind that the Solver can only produce real-number solutions.Dec 10, 2022 · Where is the equal sign on ti-84? The equal sign is the same as the enter button. ... Which is better ti-89 or ti-84 plus? The TI-89 is the better calculator. It has more functions than the TI-84 ... The Inequality app on your TI-84 Plus calculator is a powerful mathematics tool. To start the Inequality app, press [APPS]. See the first screen. Then, press [ALPHA] [ x2] if necessary, use the down-arrow key to move the cursor to the Inequalz app, and press [ENTER] to select the app. In the list of apps, this app is titled, Inequalz.Apr 25, 2017 · The first line of your TI-84 screen should now say "3*A-18=0." Enter a starting guess for the TI-84 calculator to begin its calculations. The second line of your screen should say "A=" and a number. That number is a starting guess for a solution to your equation. Since you know A must be less than 18, enter a value such as 12. 0:00 / 0:24 Where to find equal sign (TI-84 Graphing Calculator) InfinityCalcs 1.93K subscribers Subscribe 231 39K views 4 years ago Where to Find Commands on TI-84 Visit...The example below will demonstrate how to graph a simple inequality using these features. Example: Graph y<=3x+2. 1) Press the [Y=] key For Y1=, input 3x+2. 2) Repeatedly press the left arrow key until the symbol to the left of Y1 is flashing. Press the [ENTER] key repeatedly until a triangle pointing to the lower part is displayed.1,276. Getting Started with the TI-84 Plus CE Python Graphing Calculator (English) View: View. 5.7. 1,347. CE TI-Basic Programming Guide for the TI CE Family of Graphing Calculators (English) View: View. May 28, 2012 · Need more help? Set up a tutoring session with me over skype. Email me at [email protected] for more information. TI-89 Graphing Calculator For Dummies. Explore Book Buy On Amazon. Of course your calculator needs a not-equal-to sign, but the TI-89 graphing calculator also offers the @, an exclamation mark, and a sigma. The following list shows you how to produce these symbols and more:Mar 26, 2016 · To change the highlighted status of an inequality sign, place the cursor on that sign and press [ENTER]. You graph the inequalities defined in the Y= and X= editors the same way you graph a normal function. You either define the variables in the Window editor and press [GRAPH] or use one of the Zoom commands. Jul 1, 2019 · Visit InfinityCalcs.com How to locate the = command on a TI 84 PLUS. Featured playlist. 80 videos. Where to Find Commands on TI-84. InfinityCalcs. Transcript. Follow along using the... Steve Sobek will continue to the topic of programming on the TI-84 calculator by walking us through a program that will solve quadratic equations after the u...Mar 26, 2016 · To assign a value to a variable, use the. keys to place the cursor on the number currently assigned to that variable and then key in the new value. As you start to key in the new value, the old value is erased. Press [ENTER] when you’re finished entering the new value (as illustrated in the second screen, where values are assigned to ... Feb 1, 2022 · One of the easiest ways to input Sin^2 is to type in (Sin (x))2. If you are using a graphing calculator, here’s what you add – Sin (x)^2= (Sin (x))^2. Another way to input Sin^2 in a scientific calculator is to enter X > Press Sin > Press the Squared button. We understand the stress you must have gone through trying to figure out the ... Jun 4, 2020 · Step 1 Turn on your TI-84 Plus CE and press the [PRGM] key. Select NEW using the arrow keys. Select Create Newby pressing [ENTER]. FirstIntroduction Congratulations Step 2LastSkill Builder 2 Step 2 Name your program. Our program name will be HELLOXY. It can be any legal name*. Press [ENTER] after typing the name. To change the highlighted status of an inequality sign, place the cursor on that sign and press [ENTER]. You graph the inequalities defined in the Y= and X= editors the same way you graph a normal function. You either define the variables in the Window editor and press [GRAPH] or use one of the Zoom commands.If X= is displayed instead of the standard Y= when [Y=] is pressed, then the Inequality Graphing Application (App) is enabled on the TI-83 Plus family or TI-84 Plus family calculator. In order to restore the Y= Editor, the Inequality Graphing App needs to be disabled.Visit InfinityCalcs.comHow to locate the Greater Than or Equal To command on a TI 84 Plus CE.Visit InfinityCalcs.comHow to locate the Greater Than Sign command on a TI 84 PLUS.May 28, 2012 · Need more help? Set up a tutoring session with me over skype. Email me at [email protected] for more information. Jul 1, 2019 · Visit InfinityCalcs.com How to locate the = command on a TI 84 PLUS. Featured playlist. 80 videos. Where to Find Commands on TI-84. InfinityCalcs. Transcript. Follow along using the... Mar 26, 2016 · To change the highlighted status of an inequality sign, place the cursor on that sign and press [ENTER]. You graph the inequalities defined in the Y= and X= editors the same way you graph a normal function. You either define the variables in the Window editor and press [GRAPH] or use one of the Zoom commands. Apr 12, 2022 · The good news is that it’s actually very simple to do. You only need to remember simple mathematical rules. In order to calculate the 5th root of 100, just raise 100 to the 1/5th power. You can do this in the TI-84 Plus by typing: 100^ (1/5) ENTER. The 5th root of 100 is equal to 2.51189 in this example. Mar 26, 2016 · 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: Thousands of students come to Infinity Calcs to find information on TI 84 graphing calculator tutorials, games, programming and more. This app works best with JavaScript enabled. Calculators Mar 26, 2016 · TI-84 Plus CE Graphing Calculator For Dummies, 3rd Edition. The Equation Solver on your TI-84 Plus calculator is a great tool for solving one-variable equations. The Solver is also capable of solving an equation for one variable given the values of the other variables. Keep in mind that the Solver can only produce real-number solutions. VDOM DHTML tml>. Where is the = button on the TI-83 calculator? - Quora.Thousands of students come to Infinity Calcs to find information on TI 84 graphing calculator tutorials, games, programming and more. ... TI-84 Plus; TI-84 CE; TI-83 ...Mar 26, 2016 · Using the TI-84 [ENTER] key. The [ENTER] key is used to evaluate expressions and to execute commands. After you have, for example, entered an arithmetic expression (such as 5 + 4), press [ENTER] to evaluate that expression. In this context, the [ENTER] key functions as the equal sign. a year ago. p (x=4) is the height of the bar on x=4 in the histogram. while p (x<=4) is the sum of all heights of the bars from x=0 to x=4. #this only works for a discrete function like the one in video. #thankfully or not, all binomial distributions are discrete. #for a continuous function p (x=4) = 0.Learn how to find the derivative of a function at any point using the derivative option on the TI-84 Plus CE (or any other TI-84 Plus) graphing calculator.Ca...Interpolating between two known values is commonly required in fluid mechanics and thermodynamics. Writing an interpolation program into the TI 84 calculato...TI-84 Plus is a versatile, powerful graphing calculator. Take a look at the guide below if you’re just starting out. ... (Equal Sign) ≠ (Not Equal To Sign ... The Input and Prompt commands on the TI-84 Plus calculator are used in a program to solicit information from the program user. The Input command asks the user for the value of only one variable and enables the program to briefly describe the variable it is requesting. The Prompt command asks the user for the value of one or more variables, but ...To change the highlighted status of an inequality sign, place the cursor on that sign and press [ENTER]. You graph the inequalities defined in the Y= and X= editors the same way you graph a normal function. You either define the variables in the Window editor and press [GRAPH] or use one of the Zoom commands.Then press [ENTER]. This will turn off any plots that were on. 2. To clear functions, select them and press [CLEAR]. 3. Enter functions in Y1. You can enter numerous functions by using the down arrow.Use the following hints for entering functions. Use [x,t,theta,n] to type the variable "x". Use the above and then the x squared button to type "x ...Aug 9, 2016 · Graphing Systems of Linear Inequalities on the TI 84 Plus CE Graphing Calculator.If you are thinking about joining the military, read my article about joinin... 1,276. Getting Started with the TI-84 Plus CE Python Graphing Calculator (English) View: View. 5.7. 1,347. CE TI-Basic Programming Guide for the TI CE Family of Graphing Calculators (English) View: View. Finding the roots of a polynomial. Once the PlySmlt2 app has started, press [1] on the MAIN MENU to begin finding the roots of polynomials. First, configure the poly root finder mode screen. To find roots of the polynomial, Y = X 3 + 3X 2 – 6X – 8, set the order (degree) to three. See the first screen. On the MAIN MENU, press [4] to access ...Oct 29, 2020 · In this video, I give a introductory tutorial on the Texas Instruments TI-84 Plus calculator, one of the most commonly used graphing calculators today.Topics... Graphing Systems of Linear Inequalities on the TI 84 Plus CE Graphing Calculator.If you are thinking about joining the military, read my article about joinin...Oct 20, 2020 · Emulator: https://drive.google.com/file/d/1FngxJGLfCPU6DHOBk56ipTxxPc7b466F/view?usp=sharingTI-84: https://drive.google.com/file/d/1wfcUb2KSUx9omX1fq6SWu_r-S... 1,276. Getting Started with the TI-84 Plus CE Python Graphing Calculator (English) View: View. 5.7. 1,347. CE TI-Basic Programming Guide for the TI CE Family of Graphing Calculators (English) View: View. Mar 26, 2016 · 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: Thousands of students come to Infinity Calcs to find information on TI 84 graphing calculator tutorials, games, programming and more. This app works best with JavaScript enabled. CalculatorsAnother way to graph inequalities is to use the Inequality Graphing application. Some TI-84 Plus calculator already have this preloaded, so check your [Apps] menu and see if you have one called "Inequalz". If so, enable it, and then go back to the [Y=] menu. Move the cursor over the "=" sign, and then press [Alpha] and whichever inequality you ...:ClrHome Will clear any text that was on the home screen before the command was executed. On the TI-84, the Home Screen is the IO Screen. However, the TI-89 separates the two screens, so ClrIO will clear any program output, and ClrHome will only clear the Home Screen. PRGM I/O 8:ClrHome :prgmCLRHOME :Output(1,1,"1234567890123456 :Output(2,1,"7890123456789012 :Output(3,1,"3456789012345678 ... You have to be paying attention to notice that a function has been deactivated. See the first screen. Notice the equal sign next to Y 1 isn’t highlighted. This means the function has been deactivated. To activate a function that has been deactivated, move your cursor to the equal sign in the Y= editor and press [ENTER].0:00 / 0:30 Where to find Less Than or Equal To Sign (TI-84 CE Graphing Calculator) InfinityCalcs 1.95K subscribers Subscribe Share 16K views 4 years ago Where To Find Commands on TI-84...Thousands of students come to Infinity Calcs to find information on TI 84 graphing calculator tutorials, games, programming and more. This app works best with JavaScript enabled. CalculatorsOct 29, 2020 · In this video, I give a introductory tutorial on the Texas Instruments TI-84 Plus calculator, one of the most commonly used graphing calculators today.Topics... TI-84 Plus CE is Texas Instruments latest graphing calculator that comes with an LCD color display screen. See the guide below to get started. ... (Equal Sign) ≠ ...Mar 26, 2016 · To assign a value to a variable, use the. keys to place the cursor on the number currently assigned to that variable and then key in the new value. As you start to key in the new value, the old value is erased. Press [ENTER] when you’re finished entering the new value (as illustrated in the second screen, where values are assigned to ... In this tutorial, you will learn how to solve equations using the "Numeric Solver" function on the TI-84 Plus CE graphing calculator. I go over how to solve ...The new TI-84 Plus CE Python graphing calculator includes familiar features like a full-color screen, lightweight design and a rechargeable battery that can last up to a month on a single charge. Unlike laptops and tablets, the TI-84 Plus CE Python graphing calculator does not have any distractions like Wi-Fi, Bluetooth or a camera, keeping ...Mar 26, 2016 · Using the TI-84 [ENTER] key. The [ENTER] key is used to evaluate expressions and to execute commands. After you have, for example, entered an arithmetic expression (such as 5 + 4), press [ENTER] to evaluate that expression. In this context, the [ENTER] key functions as the equal sign. It's designed more for high school math so you'll likely run into many limitations. Instead, I'd suggest looking into calculators with CAS such as the Nspire CX II CAS or the HP Prime G2. If you still decide to go for the TI-84 family, then I do suggest the CE unless you're on a tight budget. The better screen, significantly faster internals ...Visit InfinityCalcs.comHow to locate the Greater Than or Equal To command on a TI 84 Plus CE.TI-84 Plus is a versatile, powerful graphing calculator. Take a look at the guide below if you’re just starting out. ... (Equal Sign) ≠ (Not Equal To Sign ...To assign a value to a variable, use the. keys to place the cursor on the number currently assigned to that variable and then key in the new value. As you start to key in the new value, the old value is erased. Press [ENTER] when you’re finished entering the new value (as illustrated in the second screen, where values are assigned to ...1,276. Getting Started with the TI-84 Plus CE Python Graphing Calculator (English) View: View. 5.7. 1,347. CE TI-Basic Programming Guide for the TI CE Family of Graphing Calculators (English) View: View.How to type fractions on the TI-84 Plus CE graphing calculator (and the TI-84 Plus C Silver Edition graphing calculator). This video also show you how to typ...Jun 12, 2019 · Visit InfinityCalcs.comHow to locate the Greater Than or Equal To command on a TI 84 Plus CE. Do to this, press APPS and choose Inequalz. You should see the 'less than', 'greater than', 'less than or equal to', or 'greater than or equal to' symbols at the bottom of the Y= screen. To change and equals sign to one of those symbols, highlight the equals sign, press ALPHA, and then press the button directly under the sign you want to use ...Jan 1, 2019 · Solving Basic Equations. Access the Numeric Solver by pressing the [Math] button, and then pressing the up arrow key to select the last option. Press enter to open it. You should now see the equation solver screen. The two boxes that are displayed represent the two sides of the equation. Type the left side of the equation into the E1 box. Jan 1, 2019 · In this tutorial, you will learn how to solve equations using the "Numeric Solver" function on the TI-84 Plus CE graphing calculator. I go over how to solve ... Before you can graph a function on your TI-84 Plus calculator, you must enter it into the calculator. The calculator can handle up to ten functions at once, Y1 through Y9 and Y0. To enter functions in the calculator, perform the following steps: Press [MODE] and put the calculator in Function mode. To highlight an item in the Mode menu, use the.The TI-84 Plus C graphing calculator is one of the most popular calculators in the world. Find out the important keystrokes you need to know to use the TI-84 Plus, and learn the math functions and constants that the TI-84 Plus C makes available to you.Jun 4, 2019 · Subscribe. 79. Share. 31K views 4 years ago Where To Find Commands on TI-84 CE. Visit InfinityCalcs.com How to locate the equal sign on TI 84 Plus CE ...more. ...more.
In the plane, u·v = u1v1 + u2v2; in space it’s u1v1 + u2v2 + u3v3. If you tell the TI-83/84 to multiply two lists, it multiplies the elements of the two lists to make a third list. The sum of the elements of that third list is the dot product of the vectors. Example: If u = [2,3,1] and v = [4,−3,2], find u·v. First invoke the summation .... Olga women
In the plane, u·v = u1v1 + u2v2; in space it’s u1v1 + u2v2 + u3v3. If you tell the TI-83/84 to multiply two lists, it multiplies the elements of the two lists to make a third list. The sum of the elements of that third list is the dot product of the vectors. Example: If u = [2,3,1] and v = [4,−3,2], find u·v. First invoke the summation ...http://mcstutoring.com/Private math tutoring and test preparation in Huntington Beach, CA. Subjects include ACT, SAT 1, algebra, geometry, and calculus.Homes...Jun 4, 2020 · Step 1 Turn on your TI-84 Plus CE and press the [PRGM] key. Select NEW using the arrow keys. Select Create Newby pressing [ENTER]. FirstIntroduction Congratulations Step 2LastSkill Builder 2 Step 2 Name your program. Our program name will be HELLOXY. It can be any legal name*. Press [ENTER] after typing the name. Apr 25, 2017 · The first line of your TI-84 screen should now say "3*A-18=0." Enter a starting guess for the TI-84 calculator to begin its calculations. The second line of your screen should say "A=" and a number. That number is a starting guess for a solution to your equation. Since you know A must be less than 18, enter a value such as 12. Feb 1, 2022 · One of the easiest ways to input Sin^2 is to type in (Sin (x))2. If you are using a graphing calculator, here’s what you add – Sin (x)^2= (Sin (x))^2. Another way to input Sin^2 in a scientific calculator is to enter X > Press Sin > Press the Squared button. We understand the stress you must have gone through trying to figure out the ... Feb 1, 2022 · One of the easiest ways to input Sin^2 is to type in (Sin (x))2. If you are using a graphing calculator, here’s what you add – Sin (x)^2= (Sin (x))^2. Another way to input Sin^2 in a scientific calculator is to enter X > Press Sin > Press the Squared button. We understand the stress you must have gone through trying to figure out the ... Emulator: https://drive.google.com/file/d/1FngxJGLfCPU6DHOBk56ipTxxPc7b466F/view?usp=sharingTI-84: https://drive.google.com/file/d/1wfcUb2KSUx9omX1fq6SWu_r-S...Perform a 1-Proportion Z-Test (hypothesis test) using a TI-83 or TI-84 graphing calculator.TI-83 at http://amzn.to/1Qiwv3P (affiliate link)TI-84 at http://am...May 15, 2013 · How to graph absolute value equations and inequalities on the TI 84 graphing calculator. Oct 19, 2022 · Here are the steps needed to set the window of your graph: Press [WINDOW] to access the Window editor. After each of the window variables, enter a numerical value that is appropriate for the functions you’re graphing. Press e after entering each number. Entering a new window value automatically clears the old value. To change the highlighted status of an inequality sign, place the cursor on that sign and press [ENTER]. You graph the inequalities defined in the Y= and X= editors the same way you graph a normal function. You either define the variables in the Window editor and press [GRAPH] or use one of the Zoom commands.Mar 26, 2016 · The second step of solving an equation in the TI-84 Plus graphing calculator's Equation Solver is to enter or edit the equation to be solved. The first step is to set the mode. To enter a new equation in the Equation Solver, follow these steps: Press [MATH] [0] to access the Equation Solver from the Math menu. The Equation Solver appears. 1,276. Getting Started with the TI-84 Plus CE Python Graphing Calculator (English) View: View. 5.7. 1,347. CE TI-Basic Programming Guide for the TI CE Family of Graphing Calculators (English) View: View. Select the TI-84 Plus SE option. Then click Next. Choose the Option: Download OS files from TI’s website Choose: TI OS Version OS 2.55 MP from the pull down menu.Jun 12, 2019 · Visit InfinityCalcs.com How to locate the Less Than or Equal To Sign command on a TI 84 Plus CE. Featured playlist. 146 videos. Where To Find Commands on TI-84 CE. InfinityCalcs. Feb 28, 2020 · Now it’s time to improve your SAT Calculator score by learning how to use a graphing calculator effectively. 1. Converting fractions to decimals. Any time you have a decimal on the Calculator section, you can change it into a fraction, provided the decimal is a rational number. This is a video in my Graphing Calculator Tutorial Series. In this video, I demonstrate how to graph inequalities on the TI-84 Plus CE graphing Calculator. I...Do to this, press APPS and choose Inequalz. You should see the 'less than', 'greater than', 'less than or equal to', or 'greater than or equal to' symbols at the bottom of the Y= screen. To change and equals sign to one of those symbols, highlight the equals sign, press ALPHA, and then press the button directly under the sign you want to use ...Mar 26, 2016 · In calculus, you need to graph the derivative of a function in order to find its critical points, which you can do on your TI-84 Plus calculator. Just follow these steps: Enter your functions in the Y= editor. Use the arrow keys to place your cursor in an open equation in the Y= editor. Press [MATH] [8] to access the nDeriv template. then press ... Free worksheets download, advance algebra, "methods" TI-84 plus download program, dividing algebraic fractions worksheet. Math revision sheets ks3, = 0.416666667 fraction, Trigonometry Answers, yardage decimal convert to fraction, freeonline test papers for primary 4. .