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Helen B. Siner
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![Operations on Numbers [Steps in Mathematics Modules #1]](https://storage.googleapis.com/menrva_img_storage/covers/9780805301311_acb3faf1.jpg)
![Quadratic Equations and Curves [Steps in Mathematics Modules #5]](https://storage.googleapis.com/menrva_img_storage/covers/9780805301359_3dcfc389.jpg)