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

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

Sorry, no.

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.

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.

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

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.

Press SHIFT MODE 8 2 to select the Norm2 display mode.
Be aware that the calculator will switch to scientific notation if the magnitude of the number goes above 10^10 or below 10^-9.

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).

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

http://www.mas.ncl.ac.uk/~ndah6/teaching/MAS1403/tutorial3.pdf


http://www.mas.ncl.ac.uk/~ndah6/teaching/MAS1403/tutorial3.pdf