**"Math Counts", all titles by Henry Pluckrose, published by Children`s Press Titles range from fairly good to excellent. Grade level roughly K-3, I would say generally more to the lower end.
**"Math Start", all titles by Stuart J. Murphy, published by HarperCollins Publishers Fair to good. Math-in-context approach. Content not sophisticated. Designed for independent reading. Math level roughly grades PS-2. Reading level grades 1-2.
**"Action Math", all titles by Ivan Bulloch, published by Thomson Learning All titles good, some excellent. Primarily geometry-based. Grade level roughly K-3
**"Discovering Math" and "Discovering Shapes", many titles by David L. Stienecker, published by Benchmark Books Entire series fair. Geometry content better than numeracy content. Grade level 3-5
**"Let`s Investigate", all titles by Marion Smoothey, published by Marshall Cavendish Fairly good. Once again, the strength of the series is geometry. Grade level 3-8