Many teachers I observed get students to put the correct response in ( ) near the incorrect response.
To inculcate independence, I may want to make it part of the students' habit of mind that each time we write ( ), we will try our best to get the right answer, ourselves.
I definitely do not want students to develop the habit of waiting for the teacher to provide a correct answer.
At the end of this, say, 20-minute segment, I will put up copies of the correct answers at the back of the room for students to self-check and write down the correct answers, if theirs is still wrong.
That is done in the same amount of time as a teacher dishing out correct answers and providing ad-hoc, impromptu explanation.
This strategy provides them with a second chance to do the task and, at the same time, the correct answers still get copied down for future reference.