G-Brain Workout Series Math Workbook for 5th Graders - Series Name: G-Brain Workout - Grade: 5th Grade - Subject: Math - Publisher: Gnoble ◆No.11 Volume of Solids and Water Level ◆No.12 Water Depth Changes and Graphs ◆No.13 Basics of Ratios - Review of 3 Usages - ◆No.14 Finding the Base Quantity - Equivalent Calculation - I have lost the memo with the specific details, so I cannot provide them, but including other listings of "G-Brain Workout 5th Grade Math," there are pencil markings on several pages in a few books, which have been erased with an eraser. The markings are auxiliary lines for diagrams and graphs, and I believe there were no answers written in.