Hold an in class quiz with essentially the same problem but with different values. The students that actually worked through the problem should be able to do it again with the changes. Those who didn’t understand and just put down what their peers got will struggle with a quiz. Bonus points if you can restructure the problem in a way to elucidate which specific aspects you think the students were skipping over with help from their peers. Feel free to have specific requirements assigned point values in the problem statement.

Don’t call them into your office and put them on the spot. That will make this adversarial. Your job is to teach them how to solve problems and communicate their methods in a clear fashion. You should reevaluate your problem writing and grading policies if just looking up answers can earn a passing grade. If you give a quiz, be up front with them that you have concerns about some students skipping the work and copying answers. Reiterate that the point of the exam was to make sure they can solve problems, the correct answer is merely a byproduct.

I will add speculation that there is a difference between what your students think you expect from an answer and what your expectations actually are. Mismatches in expectations are immensely frustrating for both parties. So don’t leave your students guessing. Give them specific examples of work of different quality and what aspects earn full points and what things might lead to point deductions. Some of the best professors I had would publish all the prior year exams with their solutions. That gave everyone the opportunity to mimic the workflow and match the level of detail expected. That also elliminates the concern of students finding the answers online or from prior year students for exams as the teacher will have had to avoid reused questions entirely.

There has to be evidence of their process for me to accept it as evidence of understanding/ability. I have made it clear to them that this is necessary. Their job is to convince me that they know what they’re doing. (But… I’m teaching HS Mathematics). So … I’d mark it wrong/incomplete. I’m also working on student understanding of consequences of their actions, so wouldn’t give them another opportunity on that exam. They would need to improve things on the next exam.

If you don’e want students to work together and learn from each other don’t give home assignments. It’s not like they won’e be able to work together irl

Nothing.
Having any homework for the holidays is already enough. Of course most of them would just want to have that gone ASAP.

Of course they cheated on a take home exam. If you ain’t cheating, you ain’t trying.

Proctor your exams if you don’t want them to be able to utilize any of the resources at their disposal. Making them do it again in front of you sounds like bullshit imo, but I am certainly not an academic.

I’d ask them to come in and redo the problem on paper at the same time, if many have the answer without any calculations, the moment you got the first one in your office, the others would be aware of what’s going on.

I think getting them to show their work is appropriate and for any that can’t replicate their work explain to them the downfalls of cheating. The other comments here justifying likely haven’t ever been in an academic setting. Relying on cheating is setting yourself up for failure if you intend to continue studying at a tertiary level.

I don’t think a punishment is necessary for cheaters just a lecture. Let them know people can and have had their degrees rescinded years after the fact when their cheating was detected with newer methods.

What does cheating mean in this context? What did they have access to that you wish they hadn’t? And if that’s the case, then why did you make this a take home exam?

Did they cheat? You were lazy & let them take an exam at home. Sounds like you should’ve expected them to use any resources available. Just because something is normal, doesn’t mean it’s right.

I’m sure your students love you…

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Throw the question out, but offer extra credit to anyone who can show their work.

A bigger picture may be; why is sending kids home for break with homework. It is my opinion, that people learn better when they actually have a break during their break. in my opinion, this is a tactic to prepare kids to think its normal to work all the time. That breaks are never actually breaks.

I appreciate the feedback. Even the negative feedback. You guys really think I’m some kind of asshole 🤣. I typed this from my phone in bed, so now that I’m at a keyboard, let me explain fully.

When I said I gave the exam over spring break, I didn’t mean it began at the beginning of spring break and ended at the end of it. That time was available for them to work on it. When I give exams, I give them a little over a week. From Tuesday to Thursday the following week. In this case, it began the Tuesday before spring break and ended the Thursday after. The reason I did this is because, like many of you, I remember papers being due immediately before or right at the end of breaks. By saying I gave it over spring break, I meant I gave them plenty of time.

I am very clear what is and is not permitted for an exam in my syllabus. They get an equation sheet, the allotted time, and they can work with a partner. Nothing else. Except for AI in which case they must screenshot everything. This is mostly for my curiosity. It still doesn’t work for physics.

When I say normal at my institution, I mean to give a take home exam. I wasn’t deviating from the norm by doing this, and it is the way I typically do it. As we have all experienced, you may have a day when you have 3 exams. Maybe that happens to only a few students. It disproportionately effects them. Giving this time, they can work it into their schedules.

So what did I see that constitutes cheating? It’s very clear to me that the students used solutions from Chegg and/or other sites. If you’ve done this sort of thing with code, you know that folks will change the names of the variables, but not the structure or logic. It reads exactly the same. That was the case here. A few students were so (hilariously) guilty of cheating, they actually rewrote the solution to a similar, but different problem. Those problems had a different number of parts!

This is not my first time doing this. I’ve done this at several other universities. In those cases, I didn’t have the issue of cheating, so I don’t have a very explicit cheating policy in my syllabus. I’m taking the advice that some have given and giving them credit for what they’ve done. I will however be telling them on Tuesday (a conversation I am NOT looking forward to having) that I know many of them cheated, that I have evidence of it, and that I will refer them to the honor council should it happen again.

The part that sucks the most is I trust students. Having done this before, I’ve found that if you trust students, respect them, they in turn respect your expectations. Given how blatant this cheating is, it feels like a betrayal. Thanks again to everyone who replied, it has given me plenty to think on.

Give points for showing work. Correct answers are only worth a small portion of the overall grade, with full points given only if all steps are shown correctly. Of course, this has to be established from the start of the school year. Changing grading policies now would be unfair.

If you don’t want students using outside resources don’t give them take-home exams. You must be new to teaching.

Do nothing, first of all any homework is open book, no buts

Second of all it comes down to not being a dick

You do realise that even if they do cheat, since its a take home you likely won’t face any negative consequence, its just a win win in general