[math teacher] your homework looks like chicken scratch, but you got them all correct
[later at home] I think she's on to us, mathmachicken
I didn't get the above chicken pun.
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Illegible handwriting resembling the marks left by chicken feet on the ground : can't read his chicken scratch on the grocery list
In other words, the teacher is saying that the student's handwriting is difficult to read, but that the answers are all right.
Mathmachicken is a combination of mathematician and chicken. The joke is that the mathematician chicken actually did the work, resulting in literal chicken scratch.
The joke is based on the premise of "chicken scratch" which means the writing is illegible.
There used to be a similar chicken on display in
This is not to be confused with
which is the math kids do when they make golden chicken nuggets disappear