Looking for a unique and engaging way to teach multiplication and division while fostering creativity in your classroom? Consider creating a wooden rekenrek, a Dutch-inspired multiplication tool, for your students. This interactive learning experience will not only captivate your students' attention but also help them understand and practice essential mathematical principles.
In this guide, we'll walk you through the process of making a teacher's wooden rekenrek. With simple materials and clear instructions, you'll soon have a custom learning tool to enhance your teaching methods. Let's dive into the crafting process!
Gather Materials and Tools
The first step in creating your wooden rekenrek is to assemble all necessary materials and tools. This project requires minimal components, making it easily accessible and budget-friendly.
Here's a list of items you'll need:
- Untreated hardwood (such as oak, maple, or birch) - approximately 0.5" (12mm) thick and 5.5" x 12" (140mm x 305mm)
- Wood glue
- Clamps
- Sandpaper (120-grit and 220-grit)
- Clear finish (such as polyurethane, varnish, or shellac)
- Ruler
- Pencil
- Drill and drill bit set (including a 1/4" or 6mm bit and a countersink bit)
- Grip tape or cork
- Rubber bands or strings (for rekenrek rods)
Choose the Right Wood
When selecting your hardwood, opt for untreated, semi-hardwoods like oak, maple, or birch. These woods are easy to work with, have a pleasant texture, and are durable enough to withstand classroom use.
To ensure a smooth, consistent finish, select a board with minimal knots and a uniform grain pattern. Keep in mind that the wood's thickness and width will determine the size of your rekenrek; thus, choose dimensions that suit your classroom's needs and allow for a balanced, sturdy base.
Prepare the Wood
Once you've chosen your wood, prepare it by cutting it down to the desired size if necessary. For a standard-sized rekenrek, a 5.5" x 12" (140mm x 305mm) board will suffice. If your board is thicker than 0.5" (12mm), you'll need to plane or cut it down to the appropriate thickness.
After cutting the board to size, use sandpaper to smooth out any rough edges or surfaces. Start with 120-grit sandpaper to remove large imperfections, then move on to 220-grit sandpaper for a smooth, polished finish.
Design and Mark the Board
Now that your wooden base is prepared, it's time to design and mark out the layout for your rekenrek. Dutch rekenreks typically feature rows of holes that correspond to numbers on a standard multiplication chart. Each row represents a multiplication table, while the holes represent the factors.
For your teacher's rekenrek, consider designing a 5 x 12 grid, which will accommodate multiplication tables up to 5 x 12. To mark out the holes, follow these steps:
Determine the Hole Spacing
First, decide on the spacing between the rows and columns. A common spacing is 0.8" - 1" (20mm - 25mm) between each hole in both directions. This spacing allows enough room for rubber bands or strings while preventing the rekenrek rods from moving too freely.
Using a ruler and pencil, mark out the center points for each hole on the board. To ensure accurate placement, start by marking out the centerlines for the rows and columns, then mark the individual hole centers along those lines.
Select the Correct Drill Bit
Once you've marked the hole centers, choose a drill bit that will create holes large enough to accommodate rekenrek rods made from rubber bands or strings. A 1/4" (6mm) or slightly larger drill bit should suffice for most rekenrek rods. If you're using thicker rods, you may need to size up to a 3/8" (9.5mm) or even 1/2" (12.7mm) drill bit.
Drill the Holes
Now that you've marked the hole centers and selected your drill bit, it's time to drill the holes in your wooden rekenrek. Start by securing the board to your work surface to ensure stability during drilling. You can use clamps, a drill press, or a drill with a standing vise.
To create perfectly aligned holes, it's essential to drill from both sides of the board. This process, known as "ountersinking," ensures that the holes are clean, even, and won't tear the wood fibers on the other side of the board. Here's how to do it:
Drill from One Side
Using a countersink bit, drill a small pilot hole from the front side of the board to prevent the wood from splitting when you drill the full-sized holes. Then, switch to your chosen drill bit and drill the full-sized holes, stopping just before you break through to the other side of the board.
Flip the Board
Flip the board over and secure it to your work surface again. Using the existing hole as a guide, drill through the remaining thickness of the board from the other side. This countersinking approach ensures that the holes are even and won't cause the rekenrek rods to catch or snag.
Repeat this process for all the marked hole centers to complete the 5 x 12 grid of holes in your wooden rekenrek.
Finish the Rekenrek
You're almost done! The final step in creating your wooden rekenrek is to finish the board with a clear coat to protect it and give it a smooth, pleasant feel. Choose a clear finish like polyurethane, varnish, or shellac, and follow the manufacturer's instructions for application and drying times.
Before applying the finish, consider adding grip tape or cork to the bottom of the board to prevent it from sliding during use. This simple addition will make the rekenrek easier to handle and keep it stable on your classroom's surfaces.
Apply the Clear Finish
Use a paintbrush or foam applicator to apply a thin, even layer of clear finish to the entire board, being careful not to get any finish in the holes. Allow the first coat to dry according to the manufacturer's instructions, then lightly sand the surface with 220-grit sandpaper to remove any raised grain or imperfections.
Apply a second coat of clear finish, and let it dry completely. For a more durable, long-lasting finish, you can apply additional coats, lightly sanding between each one. Be sure to allow the final coat to dry thoroughly before using the rekenrek to prevent smudging or smearing.
Add the Rekenrek Rods
With the finishing process complete, it's time to add the rekenrek rods to bring your tool to life. You can use rubber bands, strings, or even thin wooden dowels as rods. For rubber bands or strings, simply stretch them across the holes, and they'll stay in place due to their tension. If you prefer wooden rods, you may need to glue or insert them into the holes to keep them secure.
Now that your wooden rekenrek is complete, proudly display it in your classroom and use it to teach multiplication and division in an engaging, interactive way. Encourage your students to explore different multiplication patterns, practice skip counting, and even create their own rekenrek-inspired games.
Congratulations on creating a unique and functional learning tool! Your wooden rekenrek will not only enhance your students' understanding of mathematical concepts but also instill a sense of creativity and curiosity in your classroom. Happy crafting, and we hope you and your students enjoy using your custom rekenrek!