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# My casio fx-83GT Plus calculator wont do HCF for me

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• Casio Master

There is nothing you can do to make the calculator find the HCF for you. No point complaining about that. But if you are interested in doing it by hand (using the calculator to do the divisions for you) here how it is done.

1. Decompose the first number in prime factors. If a prime factor is repeated use the exponent notation: That helps.
2. Decompose the second number in prime factors too, using the exponent notation.
3. Now look at the two decompositions. If a prime factor is present in both decompositions it must be in the HCD /HCF, with the smallest of its two exponents.
4. Do that for all prime factors
Example: Here are the decompositions of two numbers
(2^5)*3*(5^4)(7^3)*11 and (2^3)*(5^6)*(11^2)*7
The prime factors that are present in both decompositions are
2, 5, 7, and 11
From the two decompositions select the smallest power of each common prime factor. They are represented in bold fonts.
2^3, 5^4, 7, 11
The highest common divisor/Highest common factor is
(2^3)*(5^4)*7*11

Posted on Mar 27, 2014

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Posted on Jan 02, 2017

Yes. Press SHIFT MODE 2 to select the LineIO mode.

Posted on Nov 05, 2010

SOURCE: The Tan, Sin and Cos

Press [SHIFT] [MODE] [3] to switch to degrees.

Posted on Jan 10, 2011

Your question is slightly ambiguous.

If you refer to the exponential function (power to base e = 2,7182818...), the key sequence is [SHIFT] [ln]. (rightmost button column, two rows below the ON key).

If you refer to a key allowing to enter powers of 10, like in 3,14 x 10²³, see the button labeled

its located in the bottom button row, center column.

Posted on Feb 26, 2011

SOURCE: I have a casio fx-83gt

The computational mode of your calculator is set to VERIFY. Change it to the general COMPUTATIONAL mode. Press MODE 1 (COMP).

Posted on Jun 06, 2011

SOURCE: i have a fx-83GT PLUS

To get to the general computational mode, press MODE and select 1:COMP.
To change the number display mode to another one, Press SHIFT MODE to enter SetUp. Select NORM or Sci for scientific mode.

Posted on Sep 12, 2011

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## Related Questions:

### Can you do the highest common factor on an fx-83GT PLUS casio calculator

The calculator has no application that will find the highest common divisor (or HCF) but that should not be difficult to do by hand.
Decompose the first number in prime factors. If a prime factor is repeated use the exponent notation: That helps
Decompose the second number in prime factors too, using the exponent notation.
Now look at the two decompositions. If a prime factor is present in both decomposition it must be in the HCD /HCF, with the smallest of the two exponents. Do that for all prime factors
Example;
(2^5)*3*(5^4)(7^3)*11
(2^3)*(5^6)*(11^2)*7
The prime factors that are present in both decompositions are
2, 5, 7, and 11
From the two decompositions select the smallest power of each
2^3, 5^4, 7, 11
The highest common divisor/Highest common factor is
(2^3)*(5^4)*7*11

Mar 27, 2014 | Casio Office Equipment & Supplies

### Is there a verify mode on the CASIO fx-991es plus calculator?

You should try to explore the calculator to find its capabilities. You can also read the manual. Everything is in it.
Press the Mode button, then the down arrow key. On the second page of the mode list you find 2:Verif

Mar 23, 2014 | Casio Brand New-Fx-991es Plus - Scientific...

### Casio fx-83GT-plus how to convert binary to hexadecimal

Sorry to be the carrier of bad news but the Casio FX-83 GT Plus does not have a baseN calculation mode. You cannot do any arithmetic in binary, octal or hexadecimal numeration.

Oct 06, 2013 | Casio Office Equipment & Supplies

### Casio fx-83GT plus how to convert binary to hex

Sorry to be the carrier of bad news but the Casio FX-83 GT Plus does not have a baseN calculation mode. You cannot do any arithmetic in binary, octal or hexadecimal numeration.

Oct 06, 2013 | Casio Office Equipment & Supplies

### I have just changed from using a Casio fx-83MS to a fx-83GT Plus. Is there a way of displaying a comma between every third whole number?

I do not think that Casio scientific calculators have the possibility to separate thousands, millions etc. The Sharp have that feature.

Sep 15, 2013 | Casio Office Equipment & Supplies

### Mod operation in fx-83gt plus

Like many other Casio calculators, the fx-83GT Plus doesn't provide the modulus function. You have to do it the hard way.
To calculate 19 MOD 10 (which is 9, not 10 as you state in your question), first divide 19 by 10 and note the integer portion of the result (in this case, 1). Then subtract from 19 the product of 10 and the result of the first step. The result of the subtraction is the modulus. 19 - (1*10) = 9.

May 10, 2013 | Office Equipment & Supplies

### Casio fx-115es plus how to find the LCM

I have a fx-570ES plus instead but one easy way I found to calculate the LCM us by adding 2 fractions in the following format: 1/a + 1/b, where a and b are the numbers you are calculating the LCM for. In my calculator the result is displayed as a fraction, with the denominator being the LCM. From there I can also figure out the HCF with the following formula: HCF=(a * b) / LCM. In some calculators the fraction might get displayed in decimal format but most of the newer ones can switch between fraction and decimal format. I hope this helps.

Jun 11, 2012 | Casio Office Equipment & Supplies

### Can't change from standard form on my casio fx-83gt plus

There is only one key to toggle between display formats: the S<>D key. Pressing the key repeatedly will cycle through all available display formats.

May 23, 2012 | Casio FX300WPlus Scientific Calculator

### I need to determine how get my casio fx-83gt Plus to display results up to 4 decimal places. Can you assist please?

Press [SHIFT][MODE][6][4]:

When you select FIX (by pressing [SHIFT][MODE][6] ) on your calculator you can specify number of decimal places which are displayed (you can choose any number from 0 to 9).

Sep 09, 2011 | Casio FX-300MS Calculator

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