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...liable to you are being performed correctly. • Never leave the dead battery (fx-85B/fx-280) in a solution of water and a neutral detergent and wring out. • In no event will resume once the calculator is made up of precision components. Wipe it in areas exposed to high temperature...lost profits, lost savings, or any other components by burning them. • Before assuming malfunction of dust. When exposed to low temperatures, the calculator may require more time to display results and may even fail to clean the unit. Never try to take it apart. • Avoid dropping ...
...liable to you are being performed correctly. • Never leave the dead battery (fx-85B/fx-280) in a solution of water and a neutral detergent and wring out. • In no event will resume once the calculator is made up of precision components. Wipe it in areas exposed to high temperature...lost profits, lost savings, or any other components by burning them. • Before assuming malfunction of dust. When exposed to low temperatures, the calculator may require more time to display results and may even fail to clean the unit. Never try to take it apart. • Avoid dropping ...
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Modes Application Key Mode Operation Name* Standard deviation calculations Fl SD Normal calculations Calculations using degrees F0 F4 COMP DEG Calculations using radians Calculations using grads F5 RAD F6 GRA Number of decimal place specification F7 FIX Number of display indicator indicates COMP Mode. - 3 ... * Display indicators show current mode setting. fully reread this manual and ensure that the problem is not due to low battery power (fx-85B/fx-280) or operational error. • The contents of this manual are subject to change without notice. • No part of this...
Modes Application Key Mode Operation Name* Standard deviation calculations Fl SD Normal calculations Calculations using degrees F0 F4 COMP DEG Calculations using radians Calculations using grads F5 RAD F6 GRA Number of decimal place specification F7 FIX Number of display indicator indicates COMP Mode. - 3 ... * Display indicators show current mode setting. fully reread this manual and ensure that the problem is not due to low battery power (fx-85B/fx-280) or operational error. • The contents of this manual are subject to change without notice. • No part of this...
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Note! • A mode guide is located at the top of the display screen. • DEG, RAD, and GRA modes can be used in combination with COMP and SD modes. • F9 does not exit SD mode. • F0 exits SD mode. • F0 does not clear SCI or FIX specifications. • Always press t before entering DEG, RAD, and GRA modes. • Remember to always set the operating mode and angular unit (DEG, RAD, GRA) before starting your calculation. - 4 -
Note! • A mode guide is located at the top of the display screen. • DEG, RAD, and GRA modes can be used in combination with COMP and SD modes. • F9 does not exit SD mode. • F0 exits SD mode. • F0 does not clear SCI or FIX specifications. • Always press t before entering DEG, RAD, and GRA modes. • Remember to always set the operating mode and angular unit (DEG, RAD, GRA) before starting your calculation. - 4 -
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O 7 + 6 - Basic Calculations • Use the COMP mode for basic calculations. • Example 1: 23ѿ4.5Ҁ53 23 + 4.5 , 53 = -25.5 • Example 2: 56҂(Ҁ12)Ö(Ҁ2.5) 56 -12 E \ 2.5 E = 268.8 • Example 3: 2Ö3҂(1҂1020) 2 \ 3 -1 e 20 = 6.66666666719 • Example 4: 7҂8Ҁ4҂5=36 7 - 8 , 4 - 5 = 36. • Example 5: 6 4҂5 =0.3 4 -5 \ 6AN = 0.3 • Example 6: 2҂[7ѿ6҂(5ѿ4)]҃122 2 - O 5+ 4PP = 122. • You can skip all P operations before the = key. - 5 -
O 7 + 6 - Basic Calculations • Use the COMP mode for basic calculations. • Example 1: 23ѿ4.5Ҁ53 23 + 4.5 , 53 = -25.5 • Example 2: 56҂(Ҁ12)Ö(Ҁ2.5) 56 -12 E \ 2.5 E = 268.8 • Example 3: 2Ö3҂(1҂1020) 2 \ 3 -1 e 20 = 6.66666666719 • Example 4: 7҂8Ҁ4҂5=36 7 - 8 , 4 - 5 = 36. • Example 5: 6 4҂5 =0.3 4 -5 \ 6AN = 0.3 • Example 6: 2҂[7ѿ6҂(5ѿ4)]҃122 2 - O 5+ 4PP = 122. • You can skip all P operations before the = key. - 5 -
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... after inputting a number to make that number a constant. • "K" is on the display while a constant is being used. • Use the COMP mode for constant calculations. • Example 1: 2.3ѿ3, then 2.3ѿ6 (2.3ѿ3) 2.3 + + 3 = (2.3ѿ6) 6 = K 5.3 K 8.3 • Example 2: 12҂2.3, then 12҂(ȕ9) (12҂2.3) 12 - - 2.3 = (12҂(ȕ9)) 9 E = K 27.6 K -108...17҃68 (17ѿ17) 17 + + = (17ѿ17 ѿ17) = (17ѿ17 ѿ17ѿ17) = - 6 - A x - 5 A N = 523.5987756 Constant Calculations • Press +, ,, -
... after inputting a number to make that number a constant. • "K" is on the display while a constant is being used. • Use the COMP mode for constant calculations. • Example 1: 2.3ѿ3, then 2.3ѿ6 (2.3ѿ3) 2.3 + + 3 = (2.3ѿ6) 6 = K 5.3 K 8.3 • Example 2: 12҂2.3, then 12҂(ȕ9) (12҂2.3) 12 - - 2.3 = (12҂(ȕ9)) 9 E = K 27.6 K -108...17҃68 (17ѿ17) 17 + + = (17ѿ17 ѿ17) = (17ѿ17 ѿ17ѿ17) = - 6 - A x - 5 A N = 523.5987756 Constant Calculations • Press +, ,, -
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• Example 4: 1.74҃8.3521 (1.7 2) 1.7 - - = (1.7 3) = (1.7 4) = K 2.89 K 4.913 K 8.3521 Memory Calculations • Use the COMP mode for memory calculations. • Use A Y, |, A { and Z for memory calculations. A Y replaces current memory contents. • "M" appears when there is a value in memory. • To clear memory, press 0 A Y or t A Y. • ...= A Y M 59. (23ȕ8) 23 , 8 | M 15. (56҂2) 56 - 2 | M 112. (99Ȗ4) 99 \ 4 | M 24.75 (Memory recall) Z M 210.75 • Example 2: To calculate the following using memory as shown. - 7 -
• Example 4: 1.74҃8.3521 (1.7 2) 1.7 - - = (1.7 3) = (1.7 4) = K 2.89 K 4.913 K 8.3521 Memory Calculations • Use the COMP mode for memory calculations. • Use A Y, |, A { and Z for memory calculations. A Y replaces current memory contents. • "M" appears when there is a value in memory. • To clear memory, press 0 A Y or t A Y. • ...= A Y M 59. (23ȕ8) 23 , 8 | M 15. (56҂2) 56 - 2 | M 112. (99Ȗ4) 99 \ 4 | M 24.75 (Memory recall) Z M 210.75 • Example 2: To calculate the following using memory as shown. - 7 -
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...;3)҃135. (12҂3) (45҂3) (78҂3) (Memory recall) 3 - - 12 = A Y 45 A { 78 | Z MK 36. MK 234. MK 135. MK 135. kAdditional fx-85B/fx-280 Memory Calculations • The fx-85B/fx-280 has two additional memories named A and B. • Use A J to store data and 0 to recall data. • Storing data in a memory replaces...
...;3)҃135. (12҂3) (45҂3) (78҂3) (Memory recall) 3 - - 12 = A Y 45 A { 78 | Z MK 36. MK 234. MK 135. MK 135. kAdditional fx-85B/fx-280 Memory Calculations • The fx-85B/fx-280 has two additional memories named A and B. • Use A J to store data and 0 to recall data. • Storing data in a memory replaces...
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... exceed 10. • Example 1: 2 3 ѿ 4 5 ҃1175 2 C 3 + 4 C 5 = 1 7 15. • Example 2: 3 1 4 ѿ1 2 3 ҃4 11 12 3 C 1 C 4 + 1 C 2 C 3 = 4 11 12. • Example 3: 2 4 ҃ 1 2 2 C 4 = • Example 4: 1 2 ѿ1.6҃2.1 1 C 2 + 1.6 = 2 4. 1 2. 2.1 Fraction/decimal calculation result is always decimal. - 9 - t 0 2 56088. Fraction Calculations • Use COMP mode for fraction calculations. • Total number of 123 ҂ 456 in memory B.
... exceed 10. • Example 1: 2 3 ѿ 4 5 ҃1175 2 C 3 + 4 C 5 = 1 7 15. • Example 2: 3 1 4 ѿ1 2 3 ҃4 11 12 3 C 1 C 4 + 1 C 2 C 3 = 4 11 12. • Example 3: 2 4 ҃ 1 2 2 C 4 = • Example 4: 1 2 ѿ1.6҃2.1 1 C 2 + 1.6 = 2 4. 1 2. 2.1 Fraction/decimal calculation result is always decimal. - 9 - t 0 2 56088. Fraction Calculations • Use COMP mode for fraction calculations. • Total number of 123 ҂ 456 in memory B.
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Percentage Calculations • Use COMP mode for percentage calculations. • Example 1: To calculate 12% of 1500. 1500 - 12 A v 180. • Example 2: To calculate what percentage of 880 is 660. 660 \ 880 A v 75. • Example 3: To add 15% onto 2500. 2500 - 15 A v + - 10 - 2875. • Example 5: 1 2 ↔ 0.5(Fraction ↔Decimal) 1 C 2 = C C • Example 6: 1 2 3 ↔ 5 3 1C 2C 3 A B A B 1 2. 0.5 1 2. 1 2 3. 5 3. 1 2 3.
Percentage Calculations • Use COMP mode for percentage calculations. • Example 1: To calculate 12% of 1500. 1500 - 12 A v 180. • Example 2: To calculate what percentage of 880 is 660. 660 \ 880 A v 75. • Example 3: To add 15% onto 2500. 2500 - 15 A v + - 10 - 2875. • Example 5: 1 2 ↔ 0.5(Fraction ↔Decimal) 1 C 2 = C C • Example 6: 1 2 3 ↔ 5 3 1C 2C 3 A B A B 1 2. 0.5 1 2. 1 2 3. 5 3. 1 2 3.
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...; Use COMP mode for scientific function calculations. • Some calculations may take a long time to complete. • Wait for result before starting next calculation. • =3.1415926536. kSexagesimal Functions • Example 1: 14°25'36" + 12°23'34" = 26°49'10" 14 I 25 I ...34 I = 26°49°10. - 11 - K 276. K 216. • Example 4: To discount 3500 by 25%. 3500 - 25 A v , 2625. • Example 5: To calculate the following using a constant. 12% of 1200 = 144 18% of 1200 = 216 23% of 1200 = 276 (12%) (18%) (23%) 1200 - - 12 A v 18 A v 23 A v K...
...; Use COMP mode for scientific function calculations. • Some calculations may take a long time to complete. • Wait for result before starting next calculation. • =3.1415926536. kSexagesimal Functions • Example 1: 14°25'36" + 12°23'34" = 26°49'10" 14 I 25 I ...34 I = 26°49°10. - 11 - K 276. K 216. • Example 4: To discount 3500 by 25%. 3500 - 25 A v , 2625. • Example 5: To calculate the following using a constant. 12% of 1200 = 144 18% of 1200 = 216 23% of 1200 = 276 (12%) (18%) (23%) 1200 - - 12 A v 18 A v 23 A v K...
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F 8 2 SCI 0.0 00 1 \3 = SCI 3.3-01 • Press F 9 to two places. F 7 2 FIX 0.00 1.234 +1.234 = FIX 2.47 • Example 2: 1.234ѿ1.234, rounding input to clear SCI specification. - 16 - FIX 2.46 • Example 3: 1Ö 3 , displaying result with two significant digits (SCI 2). kFIX, SCI, NORM, RND, RAN#, ENG Calculations • Example 1: 1.234ѿ1.234, rounding result to clear FIX specification. F 7 2 1.234 A b + 1.234 A b = • Press F 9 to two places (FIX 2). • Example 5: 8! 8 Af 40320.
F 8 2 SCI 0.0 00 1 \3 = SCI 3.3-01 • Press F 9 to two places. F 7 2 FIX 0.00 1.234 +1.234 = FIX 2.47 • Example 2: 1.234ѿ1.234, rounding input to clear SCI specification. - 16 - FIX 2.46 • Example 3: 1Ö 3 , displaying result with two significant digits (SCI 2). kFIX, SCI, NORM, RND, RAN#, ENG Calculations • Example 1: 1.234ѿ1.234, rounding result to clear FIX specification. F 7 2 1.234 A b + 1.234 A b = • Press F 9 to two places (FIX 2). • Example 5: 8! 8 Af 40320.
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... • If FIX or SCI is on the display, press F 9 first. • Data input always starts with A u. • Example: To calculate nҀ1, n, o, n, ⌺x, and ⌺x2 for the following data : 55, 54, 51, 55, 53, 53, 54, 52. F l SD... 0. - 18 - Statistical Calculations (SD Mode) • Press F l to enter the SD Mode for statistical calculations using the numbers 1 through 7. 7 A m 4 = 840. θ A N RAD 1.047197551 kPermutation • Example: To determine how many...
... • If FIX or SCI is on the display, press F 9 first. • Data input always starts with A u. • Example: To calculate nҀ1, n, o, n, ⌺x, and ⌺x2 for the following data : 55, 54, 51, 55, 53, 53, 54, 52. F l SD... 0. - 18 - Statistical Calculations (SD Mode) • Press F l to enter the SD Mode for statistical calculations using the numbers 1 through 7. 7 A m 4 = 840. θ A N RAD 1.047197551 kPermutation • Example: To determine how many...
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Technical Information kKeys and Their Functions • General Arithmetic calculations Backspace Q Clear(retains memory k Number input 0 - 9, l Power on; All clear t Sign change E • Memory Memory in A Y Memory minus A { Memory plus Memory recall Z • fx-85B/fx-280 Memory Memory A recall 0 1 Memory B recall 0 2 Memory M recall 0 3 Memory A store A J 1 - 21 -
Technical Information kKeys and Their Functions • General Arithmetic calculations Backspace Q Clear(retains memory k Number input 0 - 9, l Power on; All clear t Sign change E • Memory Memory in A Y Memory minus A { Memory plus Memory recall Z • fx-85B/fx-280 Memory Memory A recall 0 1 Memory B recall 0 2 Memory M recall 0 3 Memory A store A J 1 - 21 -
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In the case of values A o kExponential Display Formats This calculator can select between two formats that determine at what point exponential notation is used. • NORM 1 With NORM 1, exponential notation is automatically used for integer ...
In the case of values A o kExponential Display Formats This calculator can select between two formats that determine at what point exponential notation is used. • NORM 1 With NORM 1, exponential notation is automatically used for integer ...
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... -one. Enter the correct modes to clear the input entirely and start again. - 25 - Or you expect or if an error occurs, perform the following calculation. 1 \ 200 = 5. -03 NORM 1 format 0.005 NORM 2 format • All of which format is correct. 5. To switch between NORM 1 and NORM 2... Press F 9. F 4 (DEG mode) 3. If calculation results are working with to backspace and delete input digits one-by performing the following steps. 1. There is no indication on the display of the ...
... -one. Enter the correct modes to clear the input entirely and start again. - 25 - Or you expect or if an error occurs, perform the following calculation. 1 \ 200 = 5. -03 NORM 1 format 0.005 NORM 2 format • All of which format is correct. 5. To switch between NORM 1 and NORM 2... Press F 9. F 4 (DEG mode) 3. If calculation results are working with to backspace and delete input digits one-by performing the following steps. 1. There is no indication on the display of the ...
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...more than ±9.999999999 ҂ 1099. ("-E-" indicator appears on the display.) • To clear any of the above conditions, press t and perform the calculation from the beginning. - 26 - In this case, the operator of the last key you press is used . ("- 1-" indicator appears on the display.)... b. When an illegal mathematical operation (such as an attempt to clear only the last calculation performed. • To change the operator key w, As, etc.) you pressed. When function calculations are used , but the operation retains the order of precedence of the operation for the ...
...more than ±9.999999999 ҂ 1099. ("-E-" indicator appears on the display.) • To clear any of the above conditions, press t and perform the calculation from the beginning. - 26 - In this case, the operator of the last key you press is used . ("- 1-" indicator appears on the display.)... b. When an illegal mathematical operation (such as an attempt to clear only the last calculation performed. • To change the operator key w, As, etc.) you pressed. When function calculations are used , but the operation retains the order of precedence of the operation for the ...
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...Weak battery power is indicated when memory contents spontaneously clear, or when the display darkens under poor light and cannot be lost. Solar Cell Precautions • The solar cell requires at least 50 lux of light to provide power. • If available light is too low, the display may ...;99)to an area with the calculation from that converts available light into electrical power. Instead, the display shows all zeros. • In the case of condition e, you can continue with more light. • fx-85B/fx-280 This calculator is powered by the CASIO TWO- If this happens, move to...
...Weak battery power is indicated when memory contents spontaneously clear, or when the display darkens under poor light and cannot be lost. Solar Cell Precautions • The solar cell requires at least 50 lux of light to provide power. • If available light is too low, the display may ...;99)to an area with the calculation from that converts available light into electrical power. Instead, the display shows all zeros. • In the case of condition e, you can continue with more light. • fx-85B/fx-280 This calculator is powered by the CASIO TWO- If this happens, move to...
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...secure it ). 4. It may leak, causing serious damage to replace the battery at least once every three years, regardless of how much the calculator is facing up (so you can cause memory contents to become corrupted or lost completely. Remove the old battery. 3. Important! Remove the screws...that the positive (ѿ) side is used. Keep batteries away from direct flame and heat. • Keep batteries out of the reach of the calculator. • The battery that comes with its positive (ѿ) side facing up (so you can cause them to become shorted. Screws Battery Screws...
...secure it ). 4. It may leak, causing serious damage to replace the battery at least once every three years, regardless of how much the calculator is facing up (so you can cause memory contents to become corrupted or lost completely. Remove the old battery. 3. Important! Remove the screws...that the positive (ѿ) side is used. Keep batteries away from direct flame and heat. • Keep batteries out of the reach of the calculator. • The battery that comes with its positive (ѿ) side facing up (so you can cause them to become shorted. Screws Battery Screws...
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.../y, R →P, P →R, nPr, nCr 3. ҂, Ȗ 4. ѿ, Ҁ • Operations with operations enclosed in parentheses per- formed first. If parentheses are six reg- 1 6 isters, so calculations up to six levels can be stored. • Each level can contain up to three open parentheses, so parentheses can be nested up to turn...
.../y, R →P, P →R, nPr, nCr 3. ҂, Ȗ 4. ѿ, Ҁ • Operations with operations enclosed in parentheses per- formed first. If parentheses are six reg- 1 6 isters, so calculations up to six levels can be stored. • Each level can contain up to three open parentheses, so parentheses can be nested up to turn...
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Register Contents x4 L1 (( 5 ѿ L 2 4 ҂ L3 ((( 3 ѿ L4 2 ҂ L 5 L6 kFormulas, Ranges, and Conventions The following are the formulas, ranges, and conventions that are applied to various calculations that can be performed using this calculator. Coordinate Transformation • With polar coordinates, θ can be calculated within a range of -180° θ ͨ 180°. Y Y P (x, y) P (r, θ ) Pol r y Rec θ 0 x X 0 X - 30 - The calculation range is the same for radians and grads.
Register Contents x4 L1 (( 5 ѿ L 2 4 ҂ L3 ((( 3 ѿ L4 2 ҂ L 5 L6 kFormulas, Ranges, and Conventions The following are the formulas, ranges, and conventions that are applied to various calculations that can be performed using this calculator. Coordinate Transformation • With polar coordinates, θ can be calculated within a range of -180° θ ͨ 180°. Y Y P (x, y) P (r, θ ) Pol r y Rec θ 0 x X 0 X - 30 - The calculation range is the same for radians and grads.
