Stokes Publishing MathMaster Reference Manual

[Page 1] Stokes Publishing MathMaster

Reference Manual for the MathMaster ™ Educational Calculator a product of Stokes Publishing Company Sunnyvale, CA MathMaster ® K E Y E L I M I N A T O R 2 0 • 3 1 5 8 6 x – M+ +/– % MRC RESET 4 7 + = CE / C M – ÷ 9 8 M+ MRC RESET 4 7 ...

[Page 2] Stokes Publishing MathMaster

MathMaster Key List c Clear entry, clear 0-9, . Numeric input +-x/ Operations = Result M Add to memory m Subtract from memory r Memory recall, memory clear $ RESET Clears decimal fix and all pending operations _ Toggles sign of dispayed number % Perc...

[Page 3] Stokes Publishing MathMaster

3 Welcome to the exciting world of the MathMaster calculator. You will be using the “world’s finest four-function calculator,” the only one with the patented feature, the Key Eliminator. To take full advantage of the many features and functio...

[Page 4] Stokes Publishing MathMaster

4 • Fixing the Number of Decimal Places The decimal point may be fixed to a desig- nated number of places, from 0 to 7. • RESET Pressing the RESET key will reactivate any keys that have been disabled and return the calculator to floating decimal ...

[Page 5] Stokes Publishing MathMaster

5 Guide to Display Symbols The display holds up to eight digits. In addi- tion, there are indicators which will appear in the display to alert you to the status of the various features and functions of the MathMaster. Indicator Description Page ’ S...

[Page 6] Stokes Publishing MathMaster

6 Key Functions c, Digit keys and = Press c to turn on the calculator. You should have a “0” in the display. To display 12, press 12. Clear the display by pressing c. To display 21, press 21. Clear the display by pressing c. To display 3�...

[Page 7] Stokes Publishing MathMaster

7 Press cto clear the current number in display. Press 6+7cc. Display 0. The addition calculation has been cleared, as well as both arguments. Press cto clear errors. Key in 99,999,999. Press +1=. The display shows the error indicator. The sum ex...

[Page 8] Stokes Publishing MathMaster

8 For 4 x 5 + 3 x 2, press 4x5+3x2=. Display 26. For 4 x (5 + 3 x 2), press 5+3x2=x4=. Display 44. Constant Operations Use the constant feature to repeatedly operate with the same number. Example Press Display Use 4 as a constant. RESET or CE/C 0 2 ...

[Page 9] Stokes Publishing MathMaster

9 Example Press Display RESET or CE/C 0 10 x = = = = = 10 10 x 10 [x] 10 x10 = 100 10 x 10 x10 = 1000 10 x10 x10 x10 = 10000 10 x10 x10 x10 x10 = 100000 Notice that the counter shows the number of times the entered number is used as a factor. Examp...

[Page 10] Stokes Publishing MathMaster

10 Memory Keys The three memory keys allow the user to store, add to, subtract from, recall, and clear numbers in memory. M+ Adds displayed number to memory. (memory indicator active) M– Subtracts displayed number from memory. (memory indicator act...

[Page 11] Stokes Publishing MathMaster

11 Press rr2x3=M4x5= Mr . Display 26 Press rr3x7=M2x8= mr . Display 5 Percent Key Press 25%. Display 0.25 (assumes 25% of 1) To find 25% of 60, press 25%x60=. Display 15 To find 60 multiplied by 25%, press 60x25%=. Display 15 Discount and Markup A...

[Page 12] Stokes Publishing MathMaster

12 A dress costing $120 is to be marked up an additional 20%. What will be the new price? Press Display 120 120 + 120 [+] 20 20 %24 = 144 The new price for the dress is $144. A VCR selling for $250 is to be discounted 40%. What will the VCR cost incl...

[Page 13] Stokes Publishing MathMaster

13 Mr. Palko made a 15% commission on April sales of $12,500 and 24% commission on June sales of $9,250. What was the total of his two-month commissions? Press Display 12500 12500 x 12500 [x] 15 15 % 0.15 = 1875 M+ 1875 [M] 9250 9250 Press Display x ...

[Page 14] Stokes Publishing MathMaster

14 Change Sign Key This key finds the opposite or additive inverse of the displayed number. To display the opposite of 5, press 5–. Display -5. To display the opposite of 237, press 237–. Display -237. To display the opposite of 19, press 19–....

[Page 15] Stokes Publishing MathMaster

15 0.00 will be displayed. Use a two-place mode when working with money. If 8 or 9 is entered following the 3-second interval, the display will return to the floating-decimal point mode. Pressing RESET also returns the display to the floating-decimal...

[Page 16] Stokes Publishing MathMaster

16 Notes on Percentages A percentage must always relate to a frac- tional part of something. A statement like “25%” is meaningless unless it is known what the whole is. 25% of 40 is 10. 25% of 1,000 is 250, etc. In the MathMaster, the percent ke...

[Page 17] Stokes Publishing MathMaster

17 will result in a display of 0.16. In the problem of 40 x 16%, the first number, 40, is multi- plied by the second number, 0.16 (16% of 1) to arrive at a result of 6.4, which is consis- tent with the idea of “16% of 40.” When none of the operat...

[Page 18] Stokes Publishing MathMaster

18 numbers of your existing MathMasters. To set or change ID numbers, you must open the calculator and rotate the number wheels so that the desired digits are visible throught the ID window. A small philips screwdriver is required. Read each step all...

[Page 19] Stokes Publishing MathMaster

19 Note: Be careful not to break the two wires that attach the battery to the circuit board. 3. Locate the ID wheels in the back case and remove the screw from the X-shaped retainer. Lift the retainer free from the alignment holes in the case. Set th...

[Page 20] Stokes Publishing MathMaster

20 6. Install the retainer screw. Do not over- tighten. 7. Replace the back case and install the four screws. Be sure that no wires are pinched by the case edges when the screws are tightened. Tighten the screws snugly but do not over-tighten as this...

[Page 21] Stokes Publishing MathMaster

21 2. Remove the back case by lifting it and rotating it to the left, and placing it back- side down next to the main case. (see fig- ure B). Be careful not to break the two wires that attach the battery to the cur- cuit board. 3. Locate the battery ...

[Page 22] Stokes Publishing MathMaster

22 large post, gently push against the side of the battery until it snaps out of its retainer. Be careful not to break the wires connect- ed to the battery contacts. Lift the old battery out and set it aside. 5. Install the new battery with Plus (+) ...

[Page 23] Stokes Publishing MathMaster

23 One Year Limited Warranty The MathMaster calculator is warranted against defects of workmanship and materials for one year from the date of original purchase by the user from Stokes Publishing Company or an authorized SPC dealer. Should the calcul...

[Page 24] Stokes Publishing MathMaster

STOKES PUBLISHING COMPANY 1292 Reamwood Avenue Sunnyvale. CA 94089 Phone (408) 541-9145 • Fax (408) 541-9149 Printed in USA SPC 9/95 ...