- Key to Geometry: Triangles Parallel Lines Similar Polygons (Key to Geometry, 8)
- Key to Geometry: Perpendiculars and Parallels Chords and Tangents Circles Book 7 (Key to Geometry, 7)
- Using Decimals Book 4 (Key To Decimals)
- Key to Geometry: Lines and Segments (Key to Geometry, 1)
- Key to Percents: Percent Concepts