These are some (about 76 I think) worksheets that I have used in homeschooling my daughter this year:
She was 8 and 9 during this time. Some of them were too hard, and she required quite a bit of assistance. Also, since she is learning German, there are a handful of questions that use German number names.
They would require significant editing to be appropriate to a broad audience, but I am proud of some of them. Its hard to find good workbooks that include more than the bare minimum material that kids in the US are over-tested on.