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fx-250HC
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NQPOR
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CASIO ELECTRONICS CO., LTD. Unit 6, 1000 North Circular Road, London NW2 7JD, U.K.
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ENGLISH 1 DEUTSCH 99 ESPAÑOL 33 ITALIANO 134 FRANÇAIS 66 Contents Handling Precautions … 2 Modes … 3 Basic Calculations … 5 Constant Calculations … 6 Memory Calculations … 7 Fraction Calculations … 8 Percentage Calculations … 10 Scientific Function Calculations … 11 Statistical Calculations (SD Mode) … 16 Technical Information … 18 — 1 —
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Handling Precautions •Your calculator is made up of precision components. Never try to take it apart. •Avoid dropping your calculator and otherwise subjecting it to strong impact. • Do not store the calculator or leave it in areas exposed to high temperature or humidity, or large amounts of dust. When exposed to low temperature, the calculator may require more time to display results and may even fail to operate. Correct operation will resume once the calculator is brought back to normal tempera
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• Before assuming malfunction of the unit, be sure to care- fully reread this manual and ensure that the problem is not due to low battery power or operational error. • The contents of this manual are subject to change without notice. • No part of this manual may be reproduced in any form without the express written consent of the manufacturer. • Keep this manual on hand for future reference. Modes Key Mode Application Operation Name* Standard deviation calculations SD Fl COMP Normal calculation
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Note! •A mode guide is located above the display screen. • DEG, RAD, and GRA modes can be used in combination with the COMP and SD modes. • does not exit SD mode. F9 • exits SD mode. F0 • does not clear SCI or FIX specifications. F0 • Always press before entering DEG, RAD, and GRA t modes. • Remember to always set the operating mode and angular unit (DEG, RAD, GRA) before starting your calculation. — 4 —
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Basic Calculations • Use the COMP mode for basic calculations. • Example 1: 234.553 23 + 4.5 , 53 = –25.5 • Example 2: 56(12)(2.5) 56 -12 E \ 2.5 E = 268.8 20 • Example 3: 23(110 ) 19 2 \ 3 -1 e 20 = 6.666666667 • Example 4: 7845=36 7 - 8 , 4 - 5 = 36. 6 • Example 5: =0.3 45 4 - 5 \ 6 A N = 0.3 • Example 6: 2[76(54)]122 2 - O 7 + 6 - O 5 + 4 P P = 122. •You can skip all P operations before the = key. — 5 —
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Constant Calculations • Press +, ,, -,or \ twice 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: 2.33, then 2.36 K (2.33) 2.3 + + 3 = 5.3 K (2.36) 6 = 8.3 • Example 2: 122.3, then 12(9) K (122.3) 12 - - 2.3 = 27.6 K (12(9)) 9 E = –108. • Example 3: 1717171768 K (1717) 17 + + = 34. K (171717) = 51. K (17171717) = 68. 4 • Example 4: 1.7 8.3521 2
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Memory Calculations • Use the COMP mode for memory calculations. • Use Y, |, A { and Z for memory calculations. Y replaces current memory contents. • “M” appears when there is a value in memory. •To clear memory, press 0 Y or t Y. • Example 1: (536)(238)(562)(994)210.75 M (536) 53 + 6 = Y 59. M (238) 23 , 8 | 15. M (562) 56 - 2 | 112. M (994) 99 \ 4 | 24.75 M (Memory recall) Z 210.75 • Example 2: To calculate the following using memory as shown. M 13. — 7 —
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• Example 3: To calculate the following using memory and a constant: (123)(453)(783)135. MK (123) 3 - - 12 = Y 36. MK (453) 45 A { 135. MK (783) 78 | 234. MK (Memory recall) Z 135. Fraction Calculations • Use COMP mode for fraction calculations. •Total number of digits (including division marks) cannot exceed 10. 2 4 7 • Example 1: 1 3 5 15 2 C 3 + 4 C 5 = 1 7 15. 1 2 11 • Example 2: 3 1 4 4 3 12 3 C 1 C 4 + 1 C 2 C 3 = 4 11 12. 2 1 • Example 3:
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1 • Example 4: 1.62.1 2 1 C 2 + 1.6 = 2.1 Fraction/decimal calculation result is always decimal. 1 • Example 5: ↔ 0.5 (Fraction ↔ Decimal) 2 1 C 2 = 1 2. C 0.5 C 1 2. 2 5 • Example 6: 1 ↔ 3 3 1 C 2 C 3 1 2 3. A B 5 3. A B 1 2 3. — 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 + 2875. • 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 K (12%) 1200 - - 12 A v 144. K (18%) 18 A v 216. K (23%) 23 A v
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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 ↔ Decimal Conversion • Example: 14°25’36” ↔ 14.42667 14 I 25 I 36 I 14.42666667 A O 14°25°36 kTrigonometric/Inverse Trigonometric Functions • Example 1: sin ( rad) (RAD mode) 6 RAD A x \ 6 = S 0.5 • Example 2: cos 63°52’41” (DEG mode) DEG 63 I 52 I 41 I W 0.44028308
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kHyperbolic/Inverse Hyperbolic Functions • Example 1: sinh 3.6 3.6 M S 18.28545536 1 • Example 2: sinh 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 (log 90) 90 T 4.49980967 e Iog 64 • Example 3: 64 R \ 4 R = 3. Iog 4 0.4 3 • Example 4: 10 5 e .4 A Q + 5 - 3 E A U = 2.760821773 3 • Example 5: 2 2 A w 3 = 8. 3 • Example 6: 2 2 A w 3 E = 0.125 10 • Example 7: e 10 A U 22026.46579 — 12 —
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• Example 8: log sin 40° +log cos 35° (DEG mode) DEG 40 S R +35 W R = –0.278567983 DEG To convert to antilogarithm: A Q 0.526540784 1/3 • Example 9: 8 8 A s 3 = 2. kSquare Roots, Cube Roots, Squares, Reciprocals and Factorials • Example 1: 2 3 5 2 L + 3 L - 5 L = 5.287196909 3 3 • Example 2: 5 27 5 A D + 27 E A D = –1.290024053 2 • Example 3: 12330 123 + 30 A K = 1023. 1 • Example 4: 1 1 3 4 3 A X , 4 A X = A X 12. — 13 —
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• Example 5: 8! 8 A f 40320. kFIX, SCI, NORM, RND, RAN#, ENG Calculations • Example 1: 1.2341.234, rounding result to two places (FIX 2). FIX F 7 2 0.00 FIX 1.234 +1.234 = 2.47 • Example 2: 1.2341.234, rounding input to two places. F 7 21.234 A b + FIX 1.234 A b = 2.46 • Press F9 to clear FIX specification. • Example 3: 1 3 , displaying result with two significant digits (SCI 2). SCI F 8 2 00 0.0 SCI 1 \ 3 = –01 3.3 • Press F9 to clear SCI specification. • Example 4: To convert 56,088
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• Example 5: To convert 0.08125 grams to milligrams. –03 .08125 J 81.25 • 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 (r2, 60°) to rectangular coordinates (x, y). (DEG mode) DEG x 2 A z 60 = 1. DEG y A N 1.732050808 ANswaps displayed value with value in memory. • Example 2: To convert rectangular coordinates (1, 3) to polar coordinates (r, ). (RAD mode) RAD r 1
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kCombination • Example: To determine how many different 4-member groups can be organized in a group of 10 individuals. 10 A n 4 = 210. Statisticasl Calculations (SD Mode) • Press Flto enter the SD Mode for statistical calcula- tions using standard deviation. • If FIX or SCI is on the display, press F9 first. • Data input always starts with Au. 2 • Example: To calculate n1, n, o, n, x, and x for the following data : 55, 54, 51, 55, 53, 53, 54, 52. SD Enter SD Mode. F l 0. Input Data. A u 55
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SD Arithmetic mean A ` 53.375 SD Number of data A r 8. SD Sum of values A o 427. SD Sum of squares of values A a 22805. • }} inputs the same data twice (as above). •You can also input multiple entries of the same data using -. To input the data 110 ten times, for example, press 110 -10 }. • The above results can be obtained in any order, and not necessarily that shown above. •To delete data you have just input, press A[. — 17 —
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kMaking Corrections During Data Input • Example 1: To change data you have just input. Correct Actual Correction 51 } 50 }A [ 51 } 130 - 120 - t130 - 31 } 31 } 130 - 120 - t130 - 31 } 31 31 } • Example 2: To change data you previously input. Correct Actual Correction 51 } 49 } 49 A [ 51 } 130 - 120 - 120 - 30 A [130 - 31 } 30 } 31 } Technical Information kKey and Their Functions • General Arithmetic calculations ..........................+, ,, -, ............. \, = — 18 —
