- I ate too much pi and was sick all over my homework.

- I was attacked by a pack of pan-dimensional homework-eating dogs.

- I left it inside a Klein bottle

- I have a proof that I’ve done my homework, but there wasn’t space to write it in the margin.

- I divided by zero and my calculator blew up.

- It was too cloudy for my solar-powered calculator to work.

- I tried to do my homework, but I could only get arbitrarily close to my book. I never quite reached it.

- I got the answer 42 for every question, which left me lost in Deep Thought.

- I did half of my homework, then a quarter of it, then an eighth, then a sixteenth – but I just can’t seem to get it finished.

*i*was going to do my homework, but then*i*realised that*i*is imaginary.

giant space aliens took over my house,stole my homework and threw it into space and now there are floating math problems in the sky you may even see one of them in the stars

That’s a magnificent excuse 🙂