This post is an update to a post I wrote last year. I have found this version of the DIY rekenrek to be not only easier to make, but also more kid-friendly.
Rekenrek translates loosely to calculation rack or arithmetic rack, and it was designed by a Dutch mathematician. The rekenrek is a great visual model for developing a strong sense of 5 and 10, and it supports a strategy-based approach for learning calculations.
There are commercial rekenreks available. A company called MathRack puts out a number of different models, both student and demonstration models, but they are a little beyond my budget. I've read several blog posts on how to make your own, so I decided to give it a try. What you'll find below is a materials list, step-by-step instructions, and a link to a free, 44-page booklet on how to use the rekenrek. Weekend project anyone? :)
- 12 x 18 foam sheets. These were $0.99 at Michaels or a 12-pack for $7.99. Each sheet makes 9 rekenreks, so three sheets will make a class set of 27 rekenreks.
- Red and white pony beads (6 mm x 9 mm). I bought bags of 580 of both white and red. Each rekenrek uses 10 beads of each color, so my two bags will make 58 rekenreks. Each bag was less than $5.00.
- Black chenille stems (pipe cleaners). A bag of 100 was $2.99 at Michaels. Cut 2" off the ends of the pipe cleaners.
|Cut each foam sheet into nine 4" x 6" rectangles. I used the lines on my paper cutter and a ruler to make 4 small marks where I was going to poke the pipe cleaners through. The are 1" in from the sides and 1" apart.|
|I thought I would have to make holes with a hole punch, but I quickly realized I could easily poke a hole with the end of the pipe cleaner. Poke the ends of the pipe cleaners through on one side and fold them down.|
|Thread 5 red beads on each pipe cleaner and then 5 white beads. Poke the other ends of the pipe cleaners through to the back side.|
|Twist the ends of the pipe cleaners together.|
|The finished product!|