Tukukkk

I'm looking for a word or phrase to describe when someone copies something down incorrectly.

Specifically, the situation I am thinking about is when someone is solving a problem (using pencil and paper), and in one step, they incorrectly copy an equation or expression from their previous step:

Joe Smith got 1 point off on his math homework for a ____ [error] when
he accidentally changed a 7 to a 1.

I originally arrived at the phrase "typographical error", however when I looked this up it seemed to only apply in the case of printing or typing (as in using a keyboard or typewriter), and does not seem to apply when writing with pencil, nor does it quite convey an issue with copying from a previous step.

Is there a more appropriate phrase that I can use?

EDIT: I'm specifically looking for a noun (or noun phrase) that can be used in the same way that "typographical error" is used.

I immediately thought of typo but that doesn't include the possibility that Joe incorrectly believed it was a 1 that he saw—and so deliberately recorded it as such.

A more appropriate word is mistranscription.

[Merriam-Webster]

: a mistake in transcription : an incorrect copy

// an unlikely word that was probably a mistranscription

And from Merriam-Webster's definition of transcribe itself:

1 a : to make a written copy of
b : to make a copy of (dictated or recorded matter) in longhand or on a machine (such as a typewriter)
c : to paraphrase or summarize in writing
d : write down, record

You can use miscopy:

to copy incorrectly:

• to miscopy an address.

(Dictionary.com)

or miswrite:

to write incorrectly : to make a mistake in writing.

(M-W)