In fact, I do know kid at age 9 do better than most kids at age 11. Well, it is not my kid.
I've tried your husband's way, then I immediately quit after only one try - it dose not work for my kids.
My initial thoughts was to identify which parts are the weak points so we can work on that, then we could work "efficiently" and hope to minimise the workload. I was terribly wrong.
For example, she knows how to do perimeter but not area, she knows fraction but totally lost with percentage. These were not taught in school yet at that time. She didn't like it at all so I give up. I do not mind help her with problems she did wrong or did not know , however I do not want to teach her too much at home in advance.
We back to where we were and just try to consolidate - increasing speed and no silly mistakes etc. With her speed increased, I hope we can finish her practice book earlier than expected
