# Notes on the SHARP EL-738 calculator

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1 Chapter 1 Notes on the SHARP EL-738 calculator General The SHARP EL-738 calculator is recommended for this module. The advantage of this calculator is that it can do basic calculations, financial calculations and statistical calculations. Most of the keys can perform two functions. To perform a function written on the key, you simply press the key. To perform a function written on the surface just above the key, first press the orange 2ndF key to activate it to perform the function when pressed. 7

2 CHAPTER 1. NOTES ON THE SHARP EL-738 CALCULATOR 8

3 Contents 1 Notes on the SHARP EL-738 calculator 7 2 Normal Calculation Mode Switch on your calculator The SET UP menu Selecting a MODE Normal mode Calculator keys Financial Calculator Mode Normal mode Interest rates Simple interest Simple discount Compound interest Annuities Present value Future value Amortisation Statistical mode Mean Standard deviation Linear line

4 10 CONTENTS

5 Chapter 2 Normal Calculation Mode Display screen Key operation keys Cursor keys { Power ON/OFF and clear key Mode key Numerical and arithmetic keys 11

6 CHAPTER 2. NORMAL CALCULATION MODE 2.1 Switch on your calculator Before using your calculator for the first time, reset (initialise) it. Press the RESET switch located on the back of the calculator with the tip of a ball-point pen. After resetting the calculator, the initial display of the NORMAL mode appears. 6 ) *, - / NOTE: Pressing 2ndF M-CLR 1 = will also erase all stored data in the memory and restore the calculator s default setting. Note that I will not write the numbers 0,..., 9 in blocks. All the other functions will be writteninblocks. 2.2 The SET UP menu Press the SET UP key to display the SET UP menu. 6 ) *, - /, 5 2, 4 /, appears on the screen. Press the arrow three times and, ) 6 -! 6 ) *, - / will appear on the screen. A menu item can be selected by using the keys (the selected number will blink). Press the = key. 12

7 2.3. SELECTING A MODE To set the number of decimals, press SET UP 00., 1/ ' 6 ) *, - / appears on the screen. Press 2 to select two decimals 6 ) *, - / If you want four decimals press SET UP 0, 0, 4. (However, we will use two decimals. Press SET UP 0, 0, 2.) NOTE: The calculator uses a decimal point (0.00) where we use the decimal comma (0,00). 2.3 Selecting a MODE Press MODE. The menu display appears 6 ) *, - / 4 ) 5 6 ) 6 13

8 CHAPTER 2. NORMAL CALCULATION MODE Press 0. 6 ) *, - / appears on the screen 2.4 Normal mode The NORMAL mode allows you to perform financial, arithmetic or scientific calculations. 2.5 Calculator keys The keys are classified according to the work they do. The following keys are worth mentioning: ON: ON/C Last key, first row. To switch on the calculator. The ON/C key also clears the screen. To preserve the batteries, the calculator turns itself off after about 10 minutes. OFF:.. + The orange function on the red ON/C key. Press 2ndF ON/C to switch your calculator off. NUMERIC KEYS: 1, 2, , 0 These keys are used to enter numbers. MULTIPLICATION X Second last key, third last row. DIVISION Second last key, sixth row. EQUAL = Last key, last row. 14

9 2.5. CALCULATOR KEYS CLEAR ON/C Last key, first row. BRACKETS ( ) Last key, third last row and second last row. Use the ( and ) keys to place parentheses around parts of expressions. The closing parenthesis ) may be omitted. NEGATIVE +/- Second key, last row. This key is used to enter a negative number or change the sign of a number, while the key is used for the operation of subtraction. Note the different ways in which subtraction, with the long dash, and the sign of the number, with a small dash, are displayed. For example: 3 2 and 3+(-2). Example: Add 8 to 5 Press 8 + +/- 5 = The answer is 3. Subtract 5from8. Press 8 5 = The answer is 13. Subtract 5from 8. Press +/ /- 5 = The answer is 3. Add 5to 8 Press +/ /- 8 = The answer is 13. DELETE: DEL If you made a mistake, press DEL (last key, sixth row) to erase the number and then enter the correct number to continue. If you want to change a number or sign after you have pressed = use the cursor to move to the place where you want to change it. Enter the new number or sign, then press DEL and continue. 15

10 CHAPTER 2. NORMAL CALCULATION MODE INSERT: INS Use the cursor to move to the place where you want to insert a number. Press 2ndF INS (sixth row, last key) and enter the number. The cursor will flicker after the inserted number. TO THE POWER key y x. The 2ndF third key, fourth row Example: Calculate 2 3. Enter the base number first press 2. Then press 2ndF y x 3 = The answer is 8,00. If the power consists of more than one term, use brackets for the power. Example: Calculate (3 2 ) 4 Press ( 3 2ndF y x 2 ) 2ndF y x 4 = The answer is 6 561,00. Example: Calculate 5 2/3 Press 5 2ndF y x ( 2 3 ) = The answer is 2,92. SQUARE: (x 2 ) Use the power key. Example: Calculate 4 2. Press 4 2ndF y x 2 = The answer is 16. Example: Calculate 10 1 Press 10 2ndF y x +/- 1 = The answer is 0,10. Calculate Press 1 5 2ndF y x 2 = The answer is 0,04. 16

11 2.5. CALCULATOR KEYS SQUARE ROOT: x Use the x key. 2ndF third key, forth row. Example: Calculate means Press 2 2ndF x 64 = The answer is 8. Example: Calculate Press 3 2ndF x 64 = The answer is 4. Example: Calculate Press 4 2ndF x 3 2ndF y x 3 = The answer is 2,28. NUMERIC FRACTIONS Example: Calculate Press = The answer is Calculate Press = The answer is 1,77. LOGARITHM to the base e: ln Example: Calculate ln 3. Press 2ndF ln, (second key, second last row) 3 = The answer is 1,10. Example: Calculate ln ( ) Press 2ndF ln ( = The answer is 0,17. 17

12 CHAPTER 2. NORMAL CALCULATION MODE THE EXPONENTIAL FUNCTION: e x The inverse of ln. Example: Calculate e 1,10. Press 2ndF e x (2nd key, last row) 1.10 = The answer is 3. MEMORY: M+ The calculator has 11 temporary memories (A-H and X-Z), one independent memory (M) and one last answer memory (ANS). Temporary memory To store a value, press STO and the variable in which you want to store it. Example: Store 17 in A. Press 17 STO (fifth row, second key) A (first key, fourth row). % ) 6 ) *, - / % appears on the screen. If you want to recall the value stored in A, press RCL (first key, fifth row) A. ) 6 ) *, - / % appears on the screen. Store a value in the independent memory M+. Example: Store 19, 21 and 25 in M+. Press 19 M+ (third key, fifth row). 21 M+ 25 M+ To find the answer, press RCL M+. The answer is

13 2.5. CALCULATOR KEYS To clear the register. press 2ndF M-CLR. 6 ) *, - / appears on the screen. Press 0. 6 ) *, - / ; appears on the screen. Press 0. 6 ) *, - / appears on the screen. ERROR If ERROR 1 appears on the screen after you did a calculation press the key and the cursor will flicker where you made the mistake, press DEL and continue by pressing =. PERCENTAGE (Fourth key, sixth row) Example: Calculate 25% of R Press ndF %. The answer is 450,00. PERMUTATION Determine 5! 19

14 CHAPTER 2. NORMAL CALCULATION MODE Example: factorial n! Press 5 2ndF n! (first key, fourth row) = The answer is 120. Example: Permutations n P r Determine 10 P 5. Press 10 2ndF n P r 5 = The answer is Example: Combination n P r Determine 4 C 2. Press 4 2ndF n C r 2 = The answer is 6. 20

15 Chapter 3 Financial Calculator Mode Number of periods Interest rate per year Future value Present value Payment 21

16 CHAPTER 3. FINANCIAL CALCULATOR MODE 3.1 Normal mode TheNORMALmodeallowsustousethefinancial keys. The financial keys N, 1/Y, PV, PMT, FV can only be used when the exponent in the applicable formula consists of a single number (not a product or sum of numbers). Before using the financial keys, first clear the register by pressing 2ndF M-CLR 0, Interest rates Simple interest I = Prt Determine the amount of interest received if R1 200 is invested for 4 years at 14% simple interest per year. I = Prt = % 4 = ,14 4 = 672,00 The interest received is R672,00. We cannot use the financial keys because there is no exponent in the formula. Key in as = The answer is 672,00. S = P (1 + rt) Determine the accumulated amount for if R2 400 is invested for 42 months at a 9% simple interest rate per year. S = ( ) 1+9% = ( ) 1+0, = 3 156,00. The accumulated amount is R3 156,00. Key in as ( = The answer is 3 156,00. 22

17 3.2. INTEREST RATES Determine the simple interest rate if R3 600 accumulates to R5 760 in five years time. The simple interest rate is 12%. Key in as ( ) 5 = The answer is 0,12, that is, 12%. S = P (1 + rt) = (1 + r 5) 1+5r = r = r = ( = 0, Simple discount P = S (1 dt) Determine the present value of a promissory note that is worth R months later, and the applicable discount rate is 10,24% per year. The present value is R2 180,00. Key in as ( = The answer is 2 180,00. P = S (1 dt) P = ( ) 1 0, = 2 180,00 Determine the time under consideration (in months) if a simple interest rate of 11,76% is equivalent to a 10,25% simple discount rate. 23

18 CHAPTER 3. FINANCIAL CALCULATOR MODE By manipulating S = P (1 + rt) andp = S (1 dt) we get r = d 1 dt and t = ( 1 d ) d. r Substituting the values, we get ( ) t = 1 0,1025 0,1025 0,1176 = 1,25. The time under consideration is 1,25 years, that is, 15 months. Key in as ( ) = The answer is 1,25, that is, 15 months Compound interest S = P ( 1+ j ) tm m or S = P (1 + r) t m We use our financial keys to do the calculations because there is only one exponent in the formula: S = P (1 + r) t NB: The interest rate must be entered into the calculator as a percentage and NOT as a decimal because the calculator has been preprogrammed to automatically divide the interest rate by a hundred. Remember that it is convention to enter either the present value or future value as a negative amount. Calculate the future value if R5 000 is invested for five years at 15% per year compounded monthly. 24

19 3.2. INTEREST RATES S = P (1 + r) t = ( 1+ 0,15 12 = ,91 ) 5 12 The future value is R10 535,91. Key in as 2ndF CA (to clear the register). First enter the number of compounding periods. 2ndF P/Y (second key, third row) 12 ENT (sixth key, fifth row) ON/C +/ PV 15 I/Y 5 2ndF P/Y (first key, third row) N To check if you have entered the correct values press RCL and the financial key that you want to check. If the value is incorrect, enter the new value, press the financial key and continue. COMP FV The answer is ,91. Determine the time under consideration if R5 000 is invested at 15% per year, compounded half yearly, and the accumulated amount is R S = P (1 + r) t = ( 1+ 0,15 2 t = 4,79 The time under consideration is 4,79 years. Key in as 2ndF CA 2ndF P/Y 2 ENT ON/C ) t 2 +/ FV PV 15 l/y 25

20 CHAPTER 3. FINANCIAL CALCULATOR MODE COMP N N = appears on the screen. Because the number of compounding periods is half yearly, divided the answer by two. Press 2 = appears on the screen. 3.3 Annuities Present value P = Ra [ n i ] = R (1+i) n 1 i(1+i) n Calculate the present value of R1 600 quarterly payments for five years at an interest rate of 20% per year, compounded quarterly. The present value is R19 939,54. Key in as 2ndF CA 2ndF P/Y 4 ENT ON/C P = 1 600a 5 4 0,20 4 = ,54. +/ PMT 5 2ndF P/Y N 20 I/Y COMP PV The answer is , Future value S = Rs n i = R [ (1+i) n 1 26 i ].

21 3.3. ANNUITIES Determine the future value of R400 monthly payments made for five years at 16% interest per year, compounded monthly. The future value is R36 414,21. Key in as 2ndF CA 2ndF P/Y 12 ENT ON/C S = 400s ,16 12 = ,21 +/ 400 PMT 5 2ndF P/Y N 16 I/Y COMP FV The answer is , Amortisation Draw up an amortisation schedule for a loan of R5 000 which is repaid in annual payments over five years at an interest rate of 15% per year. Key in as 2ndF CA 2ndF P/Y 1 ENT ON/C P = Ra n i = Ra 5 0,15 R = 1 491,58 +/ PV 5 2ndF P/Y N 15 I/Y COMP PMT 27

22 CHAPTER 3. FINANCIAL CALCULATOR MODE appears on the screen. Press AMRT (fourth row, first key) 1 (Down arrow) 1 ENT Press BALANCE = appears on the screen. Press PRINCIPAL = appears on the screen. Press INTEREST = appears on the screen. Press [ 2 ENT ]twice - 6 ) ) *, - / appears on the screen. Press BALANCE = Press PRINCIPAL = Press INTEREST = Press [ 3 ENT ]twice - 6 ) 4 6 2! 6 ) *, - / appears on the screen. Press BALANCE = Press PRINCIPAL = Press INTEREST = Press [ 4 ENT ]twice Press BALANCE = Press Press PRINCIPAL = INTEREST = Press [ 5 ENT ]twice 28

23 3.3. ANNUITIES Press BALANCE = 0.02 Press Press PRINCIPAL = INTEREST =

24 CHAPTER 3. FINANCIAL CALCULATOR MODE 30

25 Chapter 4 Statistical mode Display screen Key operation keys Cursor keys { Power ON/OFF and clear key Mode key Statistical keys 31

26 CHAPTER 4. STATISTICAL MODE Given a data set, the calculator s STAT function can be used to calculate certain statistical values such as the average (mean), standard deviation and the equation of a linear line. Change to the stat mode. Press MODE 1, 0 5 J= J 6 ) *, - / 5 6 ) 6 appears on the screen. 4.1 Mean Determine the mean of the following values: 25; 30; 26; 15; 40; 35 Key the data in 25 DATA The calculator displays, ) 6 ) ) *, - / 5 6 ) 6 This means that it accepted the first data point. Keep on entering the data until the last one. 6 should be displayed. 30 DATA 26 DATA 15 DATA 40 DATA 35 DATA Calculate the mean. 32

27 4.2. STANDARD DEVIATION Press ON/C 5 J= J 6 ) *, - / 5 6 ) 6 appears on the screen. Press RCL (first key, fifth row) x (first key, seventh row) N 6 ) *, - / 5 6 ) 6 & # appears on the screen. The mean is 28, Standard deviation Determine the standard deviation of the above data. Without re-entering the data, press ON/C RCL sx (second key, seventh row). The standard deviation is 8, Linear line Please note: The calculator takes the a-value as the y-intercept and the b-value as the slope. Determine the equation of a linear line y = bx + a Press MODE 1 1 appears on the screen. 33

28 CHAPTER 4. STATISTICAL MODE 5 J= J 6 ) *, - / 5 6 ) 6 Determine the equation for the straight line passing through the points (1 ; 3) and (3 ;7). Key in as 1 x,y - (fifth key, fifth row) 3 DATA 3 x,y 7 DATA RCL a (fourth key, sixth row) a = 1 appears on the screen. RCL b (fifth key, sixth row) b = 2 appears on the screen. The equation for the straight line is y =2x +1 34

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