Thank you very much for your answer. It helped me to solve my problem I had with “lowestterms”. I have now a way of asking questions electronically which works completely well. For example: simplify: r/s + 4/t – (2r-10)/(2s). The students get marks when they get a single fraction, (with singlefrac), and they get further marks in the second knot if the fraction is in lowest terms. I consider partial points as an important feature.
My problem was, that I haven’t assigned any variables, I only used "ans1" and I tried singleFrac from “answer test” instead of AlgEquiv, Sans SingleFrac(ans1)
My next step will be to create more questions and I’m going to do a test run with students, as well as teachers, to find hidden mistakes.
“Is there a particular question in the demo course which isn't working correctly?”
I haven’t found one so far.