| The following products are generally appropriate for children age 9-12, though the individual child's abilities should be taken into consideration, as well as the drgree to which an adult will work with and help the child. |
Four Tricky Two-Way Puzzles$7.95 Turn a square into a triangle? How is that possible? Each of the four squares in this set can be transformed into a different geometric shape. See how fast you can solve them. Ages 8 to adult. 
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Four Tricky Two-Way Star Puzzles$7.95 Even a square can become a star! In this set, four squares are rearranged to form four different star shapes. Ages 8 to adult.
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Lifelike Tessellations Activity Book$12.95 This book contains a 2-page introduction covering tessellation basics, an example page, and two dozen original lifelike tessellation designs that can be copied and colored many different ways. Four other activities can be performed with each design to help learn about tessellations. By Robert Fathauer. 8-1/2" x 11".
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Regular Polygon Tessellations Activity Book$12.95 This book contains two pages of background material about tessellations, an activities example page, plus two dozen 8.5" x 11" pages of tessellations in which the individual tiles are regular polygons. There are five activities that may be performed for each page: 1) Identifying the different types of tiles in the design; 2) Identifying the unit cell for the design (the group of tiles that can be repeated to cover the plane); 3) Marking the different types of symmetry the design possesses; 4) Identifying the distinct types of vertices in the design; 5) Coloring the design. By Robert Fathauer. 8-1/2" x 11".
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Grade 4 Math by Design$19.95 By Russell F. Jacobs. 36 pages of Grade 4 math activities, including addition, subtraction, multiplication, and division of 2- and 3-digit number, as well as measurement, word problems, rounding, and more. Click here to download the table of contents in pdf format. Click here to download a sample activity in pdf format.
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Grade 5 Math by Design$19.95 By Russell F. Jacobs. 36 pages of Grade 5 math activities, including working with decimal numbers, simplifying fractions, and finding values from a straight line graph. Click here to download the table of contents in pdf format. Click here to download a sample activity in pdf format.
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Middle School Math by Design$19.95 By Russell F. Jacobs. 40 pages of middle school math activities, including least common multiples, working with percents, interpreting linear graphs, and working with signed numbers. Click here to download the table of contents in pdf format. Click here to download a sample activity in pdf format.
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Wintertime$3.95 This 10-piece foam puzzle, created originally by famed puzzle designer Stewart Coffin, contains all of the shapes (known as polyhexes) that can be made by connecting 3 or 4 regular hexagons in edge-to-edge fashion. The instructions show 8 different silhouettes with a wintertime motif. The challenge is to create these using the puzzle pieces. Ages 8 to adult. 
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X-Ball$29.95 The X-Ball is made up of 30 magnetic X-shaped pieces that click together to form a skeletal icosidodecahedron. The parts can be taken apart and rearranged in nearly endless ways. The X-Ball comes with a 96-page illustrated book that provides exercises for creative brainstorming and problem-solving.
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Zometool Creator 1$49.95 With the Creator 1 kit, you can become acquainted with the structure of space by building hundreds of models from simple to profound. 246 parts, comes in a plastic case. List price $60.
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