Casio Fx-7400G Manuale utente

Basic Calculations

In the RUN Mode you can perform arithmetic calculations (addi-

tion, subtraction, multiplication, division) as well as calculations in-

volving scientific functions.

1. Addition and Subtraction

2. Multiplication

3. Division

4. Quotient and Remainder Division

5. Mixed Calculations

6. Other Useful Calculation Features

7. Using Variables

8. Fraction Calculations

9. Selecting Value Display Modes

10. Scientific Function Calculations

Chapter 2

Basic Calculations Chapter 2

1. Addition and Subtraction

Example 6.72 + 9.08

g.hc+j.aiw

You can input the operation just as it is written. This capability is called “true alge-

braic logic.”

Be sure to press Ato clear the display before starting a new calculation.

2. Multiplication

Example 3.71 ×4.27

Ad.hb*

e.chw

• The range of this calculator is –9.99999999 ×1099 to +9.99999999 ×1099.

3. Division

Example 64 ÷4

Age/ew

Parentheses also come in handy when performing division. For full details on using

parentheses, see “Parentheses Calculation Priority Sequence”.

P.17

Basic Calculations Chapter 2

uTo use parentheses in a calculation

2 ×3 + 4

Example 1

–––––––

You should input this calculation as: (2 ×3 + 4) ÷5

A(c*d+e)/fw

Example 2 –––––

4×5

You can input this calculation as: 6 ÷(4 ×5) or 6 ÷4 ÷5.

Ag/(e*f)w

Ag/e/fw

4. Quotient and Remainder Division

This calculator can produce either the quotient or the quotient and remainder of

division operations involving two integers. Use Kto display the Option Menu for

the function key menu you need to perform quotient and remainder division.

Operation

Use the RUN Mode for quotient and remainder division.

Quotient Division .......<integer>K2(CALC)2(Int÷)<integer>w

Reminder Division .....<integer>K2(CALC)3(Rmdr)<integer>w

uTo perform quotient division

Example To display the quotient produced by 61 ÷7

AgbK2(CALC)

1234

Basic Calculations Chapter 2

2(Int÷)hw

• Remember that you can use only integers in quotient division operations. You

cannot use expressions such as 2 or sin60 because their results have a decimal

part.

uTo perform remainder division

Example To display the remainder produced by 857 ÷48

ifh3(Rmdr)eiw

Press Qto clear the Option Menu after you finish your remainder and quotient

calculations.

• Remember that you can use only integers in remainder division operations. You

cannot use expressions such as 2 or sin60 because their results have a decimal

part.

• Quotient and remainder division can also be used with lists to divide a multiple

integers by each other in a single operation.

5. Mixed Calculations

(1) Mixed Arithmetic Calculation Priority Sequence

For mixed arithmetic calculations, the calculator automatically performs multiplica-

tion and division before addition and subtraction.

Example 1 3 + 5 ×6

Ad+f*gw

Example 2 7 ×8 – 4 ×5

Ah*i-e*fw

1234

P.89

Basic Calculations Chapter 2

(2) Parentheses Calculation Priority Sequence

Expressions enclosed inside parentheses are always given priority in a calculation.

Example 1 100 – (2 + 3) ×4

Abaa-(c+d)

*ew

Example 2 (7 – 2) ×(8 + 5)

• Amultiplication sign immediately in front of an open parenthesis can be omitted.

A(h-c)(i+f)

• Any closing parentheses at the end of a calculation can be omitted, no matter

how many there are.

Parenthesesarealwaysclosedintheoperationexamplespresentedinthismanual.

(3) Negative Values

Use the -key to input negative values.

Example 56 ×(–12) ÷(–2.5)

Afg*-bc/

-c.fw

(4) Exponential Expressions

Use the Ekey to input exponents.

Example (4.5 ×1075) ×(–2.3 ×10–79)

Ae.fEhf*-c.d

E-hjw

The above shows what would appear when the exponential display range is set to

Norm 1. It stands for –1.035 ×10–3, which is –0.001035.

P.10

Basic Calculations Chapter 2

(5) Rounding

Example 74 ÷3

Ahe/dw

The actual result of the above calculation is 24.66666666… (and so on to infinity),

which the calculator rounds off. The calculator’s internal capacity is 15 digits for the

values it uses for calculations, which avoids accuracy problems with consecutive

operations that use the result of the previous operation.

6. Other Useful Calculation Features

(1) Answer Memory (Ans)

Calculation results are automatically stored in the Answer Memory, which means

you can recall the results of the last calculation you performed at any time.

uTo recall Answer Memory contents

Press !and then K(which is the shifted function of the -key).

This operation is represented as !Kthroughout this manual.

Example To perform 3.56 + 8.41 and then divide 65.38 by the result

Ad.fg+i.ebw

gf.di/!Kw

(2) Consecutive Calculations

If the result of the last calculation is the first term of the next calculation, you can use

the result as it is on the display without recallingAnswer Memory contents.

uTo perform a consecutive calculation

Example To perform 0.57 ×0.27, and then add 4.9672 to the results

Aa.fh*a.chw

+e.jghcw

Basic Calculations Chapter 2

(3) Replay

While the result of a calculation is on the display, you can usedand eto move the

cursor to any position within the expression used to produce the result. This means

you can back up and correct mistakes without having to input the entire calculation.

You can also recall past calculations you have already cleared by pressing A.

Operation

The first press of edisplays the cursor at the beginning of the expression, while

ddisplays the cursor at the end. Once the cursor is displayed, use eto move it

right and dto move it left.

uTo use Replay to change an expression

Example To calculate 4.12 ×6.4 and then change the calculation to 4.12 ×7.1

Ae.bc*g.ew

dddh.bw

Multi-Replay

Pressing Aand then for csequentially recalls and displays past calculations.

(4) Error Recovery

Whenever an error message appears on the display, press dor eto re-display

the expression with the cursor located just past the part of the expression that caused

the error. You can then move the cursor and make necessary corrections before

executing the calculation again.

uTo correct an expression that causes an error

Example To recover from the error generated by performing 148 ÷0. ×3.37

instead of 148 ÷0.3 ×3.37

Abei/a.

*d.dhw

Basic Calculations Chapter 2

d(You could also press e.)

![d

(See below for details on making

corrections.)

(5) Making Corrections

Use the dand ekeys to move the cursor to the position you want to change, and

then perform one of the operations described below. After you edit the calculation,

you can execute it by pressing w, or use eto move to the end of the calculation

and input more.

uTo change a step

Example To change cos60 to sin60

cga

ddd

uTo delete a step

Example To change 369 × × 2 to 369 ×2

dgj**c

ddD

uTo insert a step

Example To change 2.362to sin2.362

c.dgx

Basic Calculations Chapter 2

ddddd

• When you press ![a space is indicated by the symbol ‘‘t’’. The next func-

tion or value you input is inserted at the location of ‘‘t’’. To abort the insert opera-

tion without inputting anything, move the cursor, press ![again, or press

d, eor w.

7. Using Variables

A total of 26 variables, named A through Z, are available for assignment of numeric

values. Variable contents are retained even when you turn the calculator off. Note

that when you assign a value to a variable, the calculator assigns its 15-digit internal

value.

uTo assign a value to a variable

Operation

Example 1 To assign 1024 to variable A

AbaceaaAw

Example 2 To display the contents of variableA

AaAw

Example 3 To clear the contents of variable A

To clear a variable, simply assign 0 to it.

AaaaAw

Basic Calculations Chapter 2

uTo assign the same value to more than one variable

Operation

<value or expression>aa<start variable name>a3(~)a<end variable

name>w

Example To assign the result of 2 to variables A, B, C, D, and E

A!9caaAa3(~)

aEw

uTo clear the contents of all variables

In the Main Menu, select the MEM icon and press w.

Select Memory Usage.

Press cto scroll the display until “Alpha” is highlighted.

ccccccc

1(DEL)

Press 1(YES) to clear all variables or 4(NO) to abort the clear operation without

clearing anything.

1234

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