I don't follow. Do you mean to say that the calculator would produce .333333333 repeating but the student was expected to write 1/3 ?
Lets see if the kids know how to multiply fractions:
factorial(256) times ( 1 divided by factorial(256) ) equals ?
And yes, there will unfortunately be kids trying to brute force it by typing it in instead of cancelling the factorial(256).
I think the 89 is awesome for algebra because typing in an equation and doing an ans(1) with an operation will let you do the algebra process without making stupid arithmetic mistakes. I wish someone made a calculator that does this only and not one that does all the other CAS tricks for integration and derivatives. Oh and I wish they would make it RPN but that is a whole other story.