User Manual
Page 4
...data loss. • Never dispose of battery (fx-85B/fx-280), the liquid crystal panel, or other damages arising out of malfunction, repairs, or battery replacement (fx-85B/fx280), or insufficient light. 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 resume once the calculator is made up of precision components....
...data loss. • Never dispose of battery (fx-85B/fx-280), the liquid crystal panel, or other damages arising out of malfunction, repairs, or battery replacement (fx-85B/fx280), or insufficient light. 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 resume once the calculator is made up of precision components....
User Manual
Page 5
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 ... consent of display indicator indicates COMP Mode. - 3 - 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 significant digit specification F8 ...
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 ... consent of display indicator indicates COMP Mode. - 3 - 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 significant digit specification F8 ...
User Manual
Page 6
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 -
User Manual
Page 7
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 - O 7 + 6 -
User Manual
Page 8
... 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 ...17ѿ17) 17 + + = (17ѿ17 ѿ17) = (17ѿ17 ѿ17ѿ17) = - 6 - A x - 5 A N = 523.5987756 Constant Calculations • Press +, ,, - K 51. K 34. K 68.
... 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 ...17ѿ17) 17 + + = (17ѿ17 ѿ17) = (17ѿ17 ѿ17ѿ17) = - 6 - A x - 5 A N = 523.5987756 Constant Calculations • Press +, ,, - K 51. K 34. K 68.
User Manual
Page 9
....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...
User Manual
Page 10
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 anything stored there ...previously. • To clear a memory, store a zero in it. • Example 1: To input 123 in memory A. MK 135. t 123 A J 1 123. - 8 - M 13. • Example 3: To calculate...
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 anything stored there ...previously. • To clear a memory, store a zero in it. • Example 1: To input 123 in memory A. MK 135. t 123 A J 1 123. - 8 - M 13. • Example 3: To calculate...
User Manual
Page 11
... 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 123 - 456 A J 2 56088. Fraction Calculations • Use COMP mode for fraction calculations. • Total number of 123 ҂ 456 in memory B. t 0 2 56088.
... 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 123 - 456 A J 2 56088. Fraction Calculations • Use COMP mode for fraction calculations. • Total number of 123 ҂ 456 in memory B. t 0 2 56088.
User Manual
Page 12
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.
User Manual
Page 13
K 276. Scientific Function Calculations • 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...I 23 I 34 I = 26°49°10. - 11 - • 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...
K 276. Scientific Function Calculations • 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...I 23 I 34 I = 26°49°10. - 11 - • 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...
User Manual
Page 14
kTrigonometric/Inverse Trigonometric Functions • Example 1: sin ( 6 rad) (RAD mode) A x \ 6 = S RAD 0.5 - 12 - • Example 2: 1°2'3" + 4.56 = 5.594166667 1 I 2 I 3 I + 4.56 = 5.594166667 • Example 3: sin 87°65'43.21" = 0.999447513 (DEG mode) 87 I 65 I 43.21 I S 0.999447513 • Example 4: 1.23↔ 1°13'48" 1.23 I I I 1°13°48. 1.23 1°13°48. • Example 5: 12°34' ↔ 12.56666667 12 I 34 I A O 12.56666667 You can also use I when inputting values to convert between sexagesimal and decimal.
kTrigonometric/Inverse Trigonometric Functions • Example 1: sin ( 6 rad) (RAD mode) A x \ 6 = S RAD 0.5 - 12 - • Example 2: 1°2'3" + 4.56 = 5.594166667 1 I 2 I 3 I + 4.56 = 5.594166667 • Example 3: sin 87°65'43.21" = 0.999447513 (DEG mode) 87 I 65 I 43.21 I S 0.999447513 • Example 4: 1.23↔ 1°13'48" 1.23 I I I 1°13°48. 1.23 1°13°48. • Example 5: 12°34' ↔ 12.56666667 12 I 34 I A O 12.56666667 You can also use I when inputting values to convert between sexagesimal and decimal.
User Manual
Page 15
A F 5 RAD 0.785398163 A F 6 GRA 50. A F 4 DEG 45. • Example 2: cos 63°52'41" (DEG mode) 63 I 52 I 41 I W DEG 0.440283084 • Example 3: tan (ȕ35gra)(GRA mode) 35 E h GRA -0.612800788 • Example 4: cos-1 ( 2 2 rad) (RAD mode) 2A L\ 2=A V RAD 0.785398163 • Example 5: To convert 45 degrees to radians, grads, and back to accumulate, resulting in poor precision. - 13 - Repeated conversion between angle units can cause normally minute error to degrees. F 4 45 DEG 45.
A F 5 RAD 0.785398163 A F 6 GRA 50. A F 4 DEG 45. • Example 2: cos 63°52'41" (DEG mode) 63 I 52 I 41 I W DEG 0.440283084 • Example 3: tan (ȕ35gra)(GRA mode) 35 E h GRA -0.612800788 • Example 4: cos-1 ( 2 2 rad) (RAD mode) 2A L\ 2=A V RAD 0.785398163 • Example 5: To convert 45 degrees to radians, grads, and back to accumulate, resulting in poor precision. - 13 - Repeated conversion between angle units can cause normally minute error to degrees. F 4 45 DEG 45.
User Manual
Page 16
kHyperbolic/Inverse Hyperbolic Functions • Example 1: sinh 3.6 3.6 M S 18.28545536 • Example 2: sinhҀ1 30 30 M A j 4.094622224 kCommon and Natural Logarithms, Exponents • Example 1: log 1.23 1.23 R 0.089905111 • Example 2: In 90 (҃loge 90) 90 T Iog 64 • Example 3: Iog 4 64 R \ 4 R = 4.49980967 3. • Example 4: 100.4ѿ5 eȕ3 .4 A Q + 5- 3E AU= 2.760821773 • Example 5: 23 2 w 3 = 8. • Example 6: 2ȕ3 2 w 3 E = 0.125 • Example 7: e10 10 A U 22026.46579 - 14 -
kHyperbolic/Inverse Hyperbolic Functions • Example 1: sinh 3.6 3.6 M S 18.28545536 • Example 2: sinhҀ1 30 30 M A j 4.094622224 kCommon and Natural Logarithms, Exponents • Example 1: log 1.23 1.23 R 0.089905111 • Example 2: In 90 (҃loge 90) 90 T Iog 64 • Example 3: Iog 4 64 R \ 4 R = 4.49980967 3. • Example 4: 100.4ѿ5 eȕ3 .4 A Q + 5- 3E AU= 2.760821773 • Example 5: 23 2 w 3 = 8. • Example 6: 2ȕ3 2 w 3 E = 0.125 • Example 7: e10 10 A U 22026.46579 - 14 -
User Manual
Page 18
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). F 8 2 SCI 0.0 00 1 \3 = SCI 3.3-01 • Press F 9 to two places. • Example 5: 8! 8 Af 40320. 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). F 8 2 SCI 0.0 00 1 \3 = SCI 3.3-01 • Press F 9 to two places. • Example 5: 8! 8 Af 40320. 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 -
User Manual
Page 19
• Example 4: To convert 56,088 meters to kilometers. 56088 A J 56.088 03 • Example 5: To convert 0.08125 grams to polar coordinates (r, ). (RAD mode) r 1 Ay 3AL = RAD 2. - 17 - y A N DEG 1.732050808 A N swaps displayed value with value in memory. • Example 2: To convert rectangular coordinates (1, 3) to milligrams. .08125 A J 81.25-03 • Example 6: To generate a random number between 0.000 and 0.999. Example (results differ each time) A c 0.664 kCoordinate Conversion • Example 1: To convert polar coordinates (r҃2, ...
• Example 4: To convert 56,088 meters to kilometers. 56088 A J 56.088 03 • Example 5: To convert 0.08125 grams to polar coordinates (r, ). (RAD mode) r 1 Ay 3AL = RAD 2. - 17 - y A N DEG 1.732050808 A N swaps displayed value with value in memory. • Example 2: To convert rectangular coordinates (1, 3) to milligrams. .08125 A J 81.25-03 • Example 6: To generate a random number between 0.000 and 0.999. Example (results differ each time) A c 0.664 kCoordinate Conversion • Example 1: To convert polar coordinates (r҃2, ...
User Manual
Page 20
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 • ... 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 calculations using the numbers 1 through 7. 7 A m 4 = 840. θ A N RAD 1.047197551 kPermutation • Example: To determine how many different 4-member groups can be...
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 • ... 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 calculations using the numbers 1 through 7. 7 A m 4 = 840. θ A N RAD 1.047197551 kPermutation • Example: To determine how many different 4-member groups can be...
User Manual
Page 21
A o SD 427. A q SD 1.407885953 A p SD 1.316956719 A ` SD 53.375 A r SD 8. To input the data 110 ten times, for example, press 110 -10 }. • The above . • To delete data you have just input, press A [. - 19 - A a SD 22805. • } } inputs the same data twice (as above). • You can be obtained in any order, and not necessarily that shown above results can also input multiple entries of values A u 55 } 54 } 51 } 55 } 53 } } 54 } 52 } SD 52. Input Data. Sample standard deviation Population standard deviation Arithmetic mean Number of data Sum of ...
A o SD 427. A q SD 1.407885953 A p SD 1.316956719 A ` SD 53.375 A r SD 8. To input the data 110 ten times, for example, press 110 -10 }. • The above . • To delete data you have just input, press A [. - 19 - A a SD 22805. • } } inputs the same data twice (as above). • You can be obtained in any order, and not necessarily that shown above results can also input multiple entries of values A u 55 } 54 } 51 } 55 } 53 } } 54 } 52 } SD 52. Input Data. Sample standard deviation Population standard deviation Arithmetic mean Number of data Sum of ...
User Manual
Page 22
Correct Actual 51 } 49 } 130 - 120 31 } 30 } Correction 49 A [ 51 } 120 - 30 A [130 31 } - 20 - kMaking Corrections During Data Input • Example 1: To change data you have just input. Correct 51 } 130 31 } 130 31 } Actual 50 } 120 - 120 31 Correction A [ 51 } t130 31 } t130 31 } • Example 2: To change data you previously input.
Correct Actual 51 } 49 } 130 - 120 31 } 30 } Correction 49 A [ 51 } 120 - 30 A [130 31 } - 20 - kMaking Corrections During Data Input • Example 1: To change data you have just input. Correct 51 } 130 31 } 130 31 } Actual 50 } 120 - 120 31 Correction A [ 51 } t130 31 } t130 31 } • Example 2: To change data you previously input.
User Manual
Page 23
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 -
User Manual
Page 24
Memory B store A J 2 Memory M store A J 3 • Special Display/memory swap A N, A d Exponent e Internal rounding A b Parentheses O, P Pi (3.1415926536 A x Select mode F Sexagesimal I, A O Shifts key functions A • Scientific Functions Arc cosine A V Arc sine A j Arc tangent A g Common antilogarithm A Q Common logarithm R Convert to degrees A F 4 Convert to grads A F 6 Convert to radians A F 5 Cosine W - 22 -
Memory B store A J 2 Memory M store A J 3 • Special Display/memory swap A N, A d Exponent e Internal rounding A b Parentheses O, P Pi (3.1415926536 A x Select mode F Sexagesimal I, A O Shifts key functions A • Scientific Functions Arc cosine A V Arc sine A j Arc tangent A g Common antilogarithm A Q Common logarithm R Convert to degrees A F 4 Convert to grads A F 6 Convert to radians A F 5 Cosine W - 22 -