Homework help usually fails in the first two minutes, when an adult who is tired looks at an unfamiliar method and starts explaining their own. Here is an order that tends to work instead.
Minutes one to three: find the actual question
Not the topic, the sticking point. A child who says they do not understand subtraction almost always understands most of it. Ask them to do one problem out loud and stop at the exact step where they slow down. That step is the session.
Minutes four to seven: read one worked example together
Every method page here carries a full example with nothing skipped. Read it side by side rather than explaining it. The point is that they watch a complete correct example while relaxed, not while being tested.
Minutes eight to twelve: they do one alone
Leave the worked example visible and say nothing while they work. Resist correcting mid-problem; it teaches them to watch your face instead of the page. Let the error finish.
Minutes thirteen to fifteen: read the mistakes section, not the answer
If the answer is wrong, the common mistakes section on each page lists the four or five specific slips that produce wrong answers with that method. Reading those together and asking which one happened is far more useful than being told the right number. It also ends the session with a diagnosis rather than a verdict.
If it is not working, stop. Fifteen unproductive minutes is a bad evening. Thirty is a bad relationship with the subject. Write a note to the teacher saying exactly where the sticking point was. That note is more useful to them than a completed page would have been.