$5 for 1, $8 for 2, or $10 for 3. A goldmine for anyone teaching middle school math (grades 5–8) who wants to move beyond standard rote memorization and focus on deep, conceptual thinking. We meet at 3520 Rayford Road in the parking lot of HEB near the gas pumps (Grand Parkway and Rayford Road), cash only. For additional items for sale by us, click on the "more ads by this seller" link to the right of the picture.