Answer
The error was made on step 3. The third step should be
$$= 25 + 48$$
The fourth row should also be changed
$$ = 73$$
The error that was made was a multiplication error, where the student forgot to consider the minus.
Work Step by Step
The error was made on step 3. The third step should be
$$= 25 + 48$$
The fourth row should also be changed
$$ = 73$$
The error that was made was a multiplication error, where the student forgot to consider the minus.