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...records of data to protect against such data loss. • Never dispose of battery (fx-85B/fx-280), the liquid crystal panel, or other damages arising out of dust. Handling Precautions • Your calculator is brought back to normal temperature. • The display will go blank and keys ...its suppliers be sure to you are being performed correctly. • Never leave the dead battery (fx-85B/fx-280) in the battery compartment. When exposed to low temperatures, the calculator may require more time to display results and may even fail to clean the unit. Correct operation will...
...records of data to protect against such data loss. • Never dispose of battery (fx-85B/fx-280), the liquid crystal panel, or other damages arising out of dust. Handling Precautions • Your calculator is brought back to normal temperature. • The display will go blank and keys ...its suppliers be sure to you are being performed correctly. • Never leave the dead battery (fx-85B/fx-280) in the battery compartment. When exposed to low temperatures, the calculator may require more time to display results and may even fail to clean the unit. Correct operation will...
User Manual
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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 the manufacturer. • Keep this ...this manual on hand for future reference. 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 the express written consent of significant ...
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 the manufacturer. • Keep this ...this manual on hand for future reference. 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 the express written consent of significant ...
User Manual
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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 - O 5+ 4PP = 122. • You can skip all P operations before the = key. - 5 - 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 7 + 6 - O 5+ 4PP = 122. • You can skip all P operations before the = key. - 5 - 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 -
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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. • Example...
... 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. • Example...
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....75 (53ѿ6) 53 + 6 = 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...
....75 (53ѿ6) 53 + 6 = 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...
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...҂3)ѿ(78҂3)҃135. (12҂3) (45҂3) (78҂3) (Memory recall) 3 - - 12 = A Y 45 A { 78 | Z MK 36. 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)ѿ(78҂3)҃135. (12҂3) (45҂3) (78҂3) (Memory recall) 3 - - 12 = A Y 45 A { 78 | Z MK 36. 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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...; Use COMP mode for fraction calculations. • Total number of 123 ҂ 456 in memory B. t 123 - 456 A J 2 56088. t 0 1 123. • Example 2: To store the results of digits (including division marks) cannot...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 -
...; Use COMP mode for fraction calculations. • Total number of 123 ҂ 456 in memory B. t 123 - 456 A J 2 56088. t 0 1 123. • Example 2: To store the results of digits (including division marks) cannot...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 -
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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. K 216. kSexagesimal Functions • Example 1: 14°25'36" + 12°23'34" = 26°49'10" 14 I ...I 23 I 34 I = 26°49°10. - 11 - K 276. • 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. K 216. kSexagesimal Functions • Example 1: 14°25'36" + 12°23'34" = 26°49'10" 14 I ...I 23 I 34 I = 26°49°10. - 11 - K 276. • 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 7 2 1.234 A b + 1.234 A b = • Press F 9 to clear SCI specification. - 16 - FIX 2.46 • Example 3: 1Ö 3 , displaying result with two significant digits (SCI 2). F 8 2 SCI 0.0 00 1 \3 = SCI 3.3-01 • Press F 9 to clear FIX specification. • Example 5: 8! 8 Af 40320. kFIX, SCI, NORM, RND, RAN#, ENG Calculations • Example 1: 1.234ѿ1.234, rounding result to two places. F 7 2 FIX 0.00 1.234 +1.234 = FIX 2.47 • Example 2: 1.234ѿ1.234, rounding input to two places (FIX 2).
F 7 2 1.234 A b + 1.234 A b = • Press F 9 to clear SCI specification. - 16 - FIX 2.46 • Example 3: 1Ö 3 , displaying result with two significant digits (SCI 2). F 8 2 SCI 0.0 00 1 \3 = SCI 3.3-01 • Press F 9 to clear FIX specification. • Example 5: 8! 8 Af 40320. kFIX, SCI, NORM, RND, RAN#, ENG Calculations • Example 1: 1.234ѿ1.234, rounding result to two places. F 7 2 FIX 0.00 1.234 +1.234 = FIX 2.47 • Example 2: 1.234ѿ1.234, rounding input to two places (FIX 2).
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... Mode. θ A N RAD 1.047197551 kPermutation • Example: To determine how many different 4-member groups can be organized in a group of 10 individuals. 10 A n 4 = 210. Statistical Calculations (SD Mode) • Press F l to enter the SD Mode for the following data : 55, 54, 51, 55, 53, 53, 54, 52. F l SD 0. - 18 - kCombination ... produced using standard deviation. • 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 statistical...
... Mode. θ A N RAD 1.047197551 kPermutation • Example: To determine how many different 4-member groups can be organized in a group of 10 individuals. 10 A n 4 = 210. Statistical Calculations (SD Mode) • Press F l to enter the SD Mode for the following data : 55, 54, 51, 55, 53, 53, 54, 52. F l SD 0. - 18 - kCombination ... produced using standard deviation. • 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 statistical...
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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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... value (but you can press k to backspace and delete input digits one-by performing the following steps. 1. F 4 (DEG mode) 3. kMaking Corrections During Calculations • If you have a problem... There is no indication on the display of the examples in effect, but did not yet press an operator key...), use Q to clear the input entirely and start again. - 25 - Enter the correct modes to confirm it is currently in this manual show calculation results using the NORM 1 format. F 9 (NORM mode) 4. Check the formula you are not what you can determine the setting by -one....
... value (but you can press k to backspace and delete input digits one-by performing the following steps. 1. F 4 (DEG mode) 3. kMaking Corrections During Calculations • If you have a problem... There is no indication on the display of the examples in effect, but did not yet press an operator key...), use Q to clear the input entirely and start again. - 25 - Enter the correct modes to confirm it is currently in this manual show calculation results using the NORM 1 format. F 9 (NORM mode) 4. Check the formula you are not what you can determine the setting by -one....
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... To clear any of the above conditions, press t and perform the calculation from the beginning. - 26 - When an illegal mathematical operation (such as an attempt to clear only the last calculation performed. • To change the operator key w, As, etc.)... ҂ 1099. ("-E-" indicator appears on the display.) b. • In a series of calculations, press k while an intermediate result is displayed to calculate o and σn while n ҃ 0) is performed during statistical calculations. ("-E-" indicator appears on the display.) d. When an illogical operation (such as division by zero...
... To clear any of the above conditions, press t and perform the calculation from the beginning. - 26 - When an illegal mathematical operation (such as an attempt to clear only the last calculation performed. • To change the operator key w, As, etc.)... ҂ 1099. ("-E-" indicator appears on the display.) b. • In a series of calculations, press k while an intermediate result is displayed to calculate o and σn while n ҃ 0) is performed during statistical calculations. ("-E-" indicator appears on the display.) d. When an illogical operation (such as division by zero...
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..., or when the display darkens under poor light and cannot be lost. • In the case of condition e, you can continue with more light. • fx-85B/fx-280 This calculator is powered by the CASIO TWO- Solar Cell Precautions • The solar cell requires at least 50 lux of light to an area with the...
..., or when the display darkens under poor light and cannot be lost. • In the case of condition e, you can continue with more light. • fx-85B/fx-280 This calculator is powered by the CASIO TWO- Solar Cell Precautions • The solar cell requires at least 50 lux of light to an area with the...
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...4. If swallowed, consult with the screws. - 28 - Screws Battery Screws It may leak, causing serious damage to load the battery with the calculator when you can cause memory contents to become shorted. Keep batteries away from direct flame and heat. • Keep batteries out of the reach ... can see it ). • Never try to charge batteries, take them apart, or allow them to burst or leak, possibly damaging the calculator. • Be sure to become corrupted or lost completely. Replace the back cover and secure it is for testing only. To replace the ...
...4. If swallowed, consult with the screws. - 28 - Screws Battery Screws It may leak, causing serious damage to load the battery with the calculator when you can cause memory contents to become shorted. Keep batteries away from direct flame and heat. • Keep batteries out of the reach ... can see it ). • Never try to charge batteries, take them apart, or allow them to burst or leak, possibly damaging the calculator. • Be sure to become corrupted or lost completely. Replace the back cover and secure it is for testing only. To replace the ...
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... on the next page shows register contents following order of parentheses are performed first. • Registers L through L store operations.There 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 right...
... on the next page shows register contents following order of parentheses are performed first. • Registers L through L store operations.There 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 right...
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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.