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FAQ | Calculators

Features and usage

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What is the [F CUT 5/4] switch or [DEC] F, 0, 2 button for? (HR-8 series)

The HR-8 series have a [DEC] key with F, 0, 2, and 5/4 over it, while many other calculators models have a switch labeled [F CUT 5/4]. The button or switch can control rounding off to a certain number of decimal places. F is floating point (no F indicator on screen), 0 rounds off to 0 places after decimal point, and 2 rounds off to 2 places after decimal point. The 5/4 applies to either the 0 or 2 modes, and describes the type of rounding off that is performed. The calculator will round down if the digit after the one you are rounding to is 4 or lower, and round up if the digit is 5 or higher.

What is the purpose of the GT Key?

Whenever the “=” Key has been pressed, the result will be stored into the Grand Total Memory! The “GT” Key is to recall the Grand Total Memory! It’s function is similar to the “MR” Key, both of them are used for recalling the Memory Content! Please note that the GT Memory will be cleared by pressing the “AC” Key in most of the CASIO Models! For other Models, it can only be cleared by pressing the “GT” Key twice!

What is the use of the Slide Switch?

F: Floating Decimal CUT: Values are cut off to the number of decimal places specified by the current Decimal Place Selector setting UP: Values are rounded up to the number of decimal places specified by the current Decimal Place Selector setting 5/4: Values are rounded off (0,1,2,3,4 are cut off; 5,6,7,8,9 are rounded up) to the number of decimal places specified by the current Decimal Place Selector setting 4,3,2,1,0: Specifies the number of decimal places as 4,3,2,1,0 ADD2: 2 decimal places are assumed for entries and results of all addition and subtraction operations. Entering 2 only results in a value of 0.02 for the entry. If you use the "." key during entry of a value, the decimal point is included at the place you specify. This mode is no effect on multiplication and division operations.

Please tell me how to do currency conversion.

1. Press [M/EX] to toggle between the Conversion mode and Memory mode. 2. The “EXCH” indicator on the display indicates the Conversion mode. • To set conversion rates Currency 1 [C1] is your home country currency, and so it is always set to 1. Currency 2 [C2] and Currency 3 [C3] are for the currencies of two other countries, and you can change these rates as required. Some models have one more conversion rate setting named Currency 4 [C4], whose rate can also be changed. Example: To set a conversion rate 1 USD ([C1] home currency) = 0.95 EUR for Currency 2 ([C2]) Press [AC], and hold [%] about two seconds. Then input [C2] 0.95 [%]. Using [C1] and [C2] above, convert 95 EUR to USD. Press [AC], Then input 95 [C2] [C1]. Using [C1] and [C2] above, convert 100 USD to EUR. Press [AC], and input 100 [C1] [C2]. *You can check the currently set rate by pressing [AC] and then [C2] *Some models are equipped with [C/AC] key instead of separate [C] and [AC] keys. For such models, press [C/AC] once to perform [C] operation or twice to perform [AC] operation.

How can I load
paper into my
HR-8 series
calculator?

Slide off the upper cover of the calculator, and cut across the paper roll to form a clean end. If you are mounting the roll externally (outside of the back of the calculator), then look for a slot in the rear of the calculator, which will accept the paper. Feed the end of the paper through the rear slot, and then into the internal feed slot, and hold the [FEED] key. After that, you can flip the arm back to mount the roll and replace the upper cover. If you want to place the roll inside of the calculator, then you need to feed from the bottom of the roll into the internal feed slot, and hold the [FEED] key. After you are finished, replace the upper cover.

What is Constant Calculation?

Press "×", "÷" twice to register a constant. The "K" indicator is displayed to indicate that a constant in effect. And the "K" symbol indicates the constant lock is valid. Please note that this will reverse the order of the input values, for example, if you input 4 ÷÷ 2, the result will be 0.5. (i.e. 2 ÷ 4) A constant lock can help to multiply/divide the constant number against a whole set of number. For example, if the calculation is 5×1, 5×2, 5×3, you can input 5 [×] [×] 1 [=] 2 [=] 3 [=] as the constant is 5.

What kind of keys can print out the item count in ITEM mode ?

For the number of addition and subtraction, press [◇/#] or [*] will print out the result with the total item count. For the number of [*] key operation, press [G*]. For some printers, pressing [M◇] or [M*] key will print the total number of [M+] and [M-] key operations up to that point along with the value stored in the independent memory. Besides, of course, pressing [IT] key can recall the item no.

How do I set time and date on DR-T120/ DR-T220

Example: March 15, 2008, 10:30 AM 1. Press [CA] 2. Press [TIME] 3. Hold down [%] for about 2 seconds 4. Press 103003152008 5. Press [TIME] 6. Press [TIME]

What is [◇/#] key and how it is used ?

When used in calculation, [◇/#] is used as a subtotal key. The printout symbol will be (◇). When used in printing reference number, date and etc that not related in calculation, The printout symbol will be (#).

How to change the currency rate on DF-320TM or MS-300M?

These calculators use a slightly different procedure compared to other Casio calculators. Up to seven conversion rates can be registered. Each one has a name, such as € -> $. The rate that you specify here would be from the first currency to the second, but conversions can be done in both directions. For example, if you want to set a conversion rate of 1 euro to 0.93 US dollars, here is what you would do (using C1 for euros and C2 for US dollars): 1. Press [AC] 2. Hold [RATE SET/%] for about two seconds until "SET" appears 3. Press [C2] to select currency 2 4. Press [+] repeatedly to select the currency name (such as € -> $) 5. Input the conversion rate (0.93) and then press [RATE SET/%] to store it in memory

What is Constant Calculation?

Press "+", "-", "×", "÷" twice to register a constant. The "K" indicator is displayed to indicate that Constant Calculation is in effect. This will reverse the order of the input values, for example, if you input 4--3, the result of the constant calculation will be 3-4!

What is the purpose of the Top and the Second Lines of the Display?

The Top and the Second Lines will be used for the display of the result of some Special Functions, such as, Tax Calculation, Constant Calculation, Currency Exchange, Cost/Sell/Margin Calculation, and Change Calculation! The Display will be the same as a Single Line Display Calculator for Normal Calculation!

When will the "E" icon(the little symbol "E" appears on the left ) appear?

“E” (icon will be ON under the following situations: 1. Overflow Error (Please refer the "Overflow error FAQ") 2. Memory Overflow Error(both Independent Memory and GT Memory) 3. Any number divided by zero 4. Square Root on any Negative Number In order to clear the "E" symbol, you can either press the C Key or simply press the AC Key to clear the whole operation.

How do change the currency rate?

When you press the [M/EX] key, it toggles between conversion mode and memory mode. You will see "EXCH" on the display when in conversion mode. C1, C2, and C3 are three conversion rates. C1 is your home country currency, and so it is always set to 1. C2 and C3 are rates for two other countries, which you can change. For example, if you want to set a conversion rate of $1 to 0.95 euros, here is what you would do (using C1 for US dollars and C2 for euros): 1. Press [AC] 2. Hold [SET/%] for about two seconds until "SET" appears 3. Press [C2] to select currency 2 4. Input the conversion rate (0.95) and then press [SET/%] to store it in memory You can check the currently set rate at any time by pressing [AC] and then [C2].

What is Round Numbers Calculation?

Round Numbers Calculation mean when overflow error occur, for example (8 digits calculation): 99’999’999 x 123 = E 122.99999 (the round number of the result is the display value x 100’000’000 = 12’299’999’000, where the actual answer is 12’299’999’877). Then press [C] to clear the error and continue the calculation.

Is there anything I need to keep in mind when performing a calculation?

Yes. Remember that calculations are performed in accordance with a specific "calculation priority sequence". For example, multiplication and division operations are executed before addition and subtraction operations. Also, each calculator model performs calculations in accordance with a preset calculation priority sequence. Check the applicable section in your calculator's user's guide for information about the calculation priority sequence it uses for calculations. (Chapters: Calculation Priority Sequence; Order of Operations; Order of Operations and Levels) Example: -4^2 result –16 2+3*4 result 14 In the first example, 4 is squared and then the result is made a negative value. This is because the power operation has a higher priority than the negative sign. In the second example, the 3*4 operation is performed first, and then the result is added to 2. This is because multiplication and division has a higher calculation priority than addition and subtraction. Note Expressions enclosed in parentheses are given top priority. Parentheses can be nested inside each other. In this case, the expression inside the innermost set of parentheses is given top priority. Examples: (-4)^2 Result 16 (2+3)*4 Result 20

How do I enter the square, power 3, power 4 of a certain number ?

Use the keys [×][=]. For example, to get 2.5 square, you can press 2.5 [×] [×] [=]. To get power 3 of 2.5, press 2.5 [×] [×] [=] [=]. To get power 4 of 2.5, press 2.5 [×] [×] [=] [=] [=].

With the addition and subtraction, what is the difference between ITEM+ mode and ITEM +/- mode?

For both ITEM+ and ITEM +/- mode, the total number of addition and subtraction items is printed with the result when [◇/#] or [*] is pressed. But the item count method is different. Under ITEM +/- mode, addition will be counted as "+1" whereas subtraction will be counted as "-1". However, under the ITEM+ mode, both addition and subtraction will be counted as "+1".

Is there anything I need to keep in mind when performing a calculation?

Yes. Remember that calculations are performed in accordance with a specific "calculation priority sequence". For example, multiplication and division operations are executed before addition and subtraction operations. Also, each calculator model performs calculations in accordance with a preset calculation priority sequence. Check the applicable section in your calculator's user's guide for information about the calculation priority sequence it uses for calculations. (Chapters: Calculation Priority Sequence) Example: -4^2 result –16 2+3*4 result 14 In the first example, 4 is squared and then the result is made a negative value. This is because the power operation has a higher priority than the negative sign. In the second example, the 3*4 operation is performed first, and then the result is added to 2. This is because multiplication and division has a higher calculation priority than addition and subtraction. Note Expressions enclosed in parentheses are given top priority. Parentheses can be nested inside each other. In this case, the expression inside the innermost set of parentheses is given top priority. Examples: (-4)^2 Result 16 (2+3)*4 Result 20

Is there anything I need to keep in mind when performing a calculation?

Yes. Remember that calculations are performed in accordance with a specific "calculation priority sequence". For example, multiplication and division operations are executed before addition and subtraction operations. Also, each calculator model performs calculations in accordance with a preset calculation priority sequence. Check the applicable section in your calculator's user's guide for information about the calculation priority sequence it uses for calculations. (Chapters： Calculation Priority Sequence; Order of Operations; Order of Operations and Levels) Example: -4^2 result -16 2+3*4 result 14 In the first example, 4 is squared and then the result is made a negative value. This is because the power operation has a higher priority than the negative sign. In the second example, the 3*4 operation is performed first, and then the result is added to 2. This is because multiplication and division has a higher calculation priority than addition and subtraction. Note Expressions enclosed in parentheses are given top priority. Parentheses can be nested inside each other. In this case, the expression inside the innermost set of parentheses is given top priority. 　 Examples: (-4)^2 result 16 (2+3)*4 result 20

How does the [MENU] key work?

When you press the [MENU] key, the main menu is displayed. Each calculation can be performed by selecting each function mode such as statistics and graphs.

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