It is called the REKENREK.
To use the rekenrek, you begin with all beads slid to the right side like the picture above.
For a kindergarten classroom, you would want to create an individual rekenrek for each child. However, since we do not begin with students counting from 0-20 at the beginning of class, you would create one and simply cover the bottom row with a folded 3x5 card to block it out to only work with the numbers 0-10 like below.
Creating your own rekenreks is very simple and inexpensive. Pony beads are sold everywhere including Michael's and Hobby Lobby. However, I found them very inexpensively at Beadkraft.com.
To make a rekenrek, you will need:
1) plastic canvas
2) 10 red pony beads
3) 10 white pony beads
4) 2 pipe cleaners
5) optional: 1 folded 3x5 card
1st) String 5 white beads and 5 red beads on each of the two pipe cleaners.
2nd) String the pipe cleaners through the back of the plastic canvas.
4th) adjust as needed so that the lines are fairly straight and the beads can move smoothly.
The rekenrek is turned like this to begin using.
I have a new board on pinterest called Singapore Math. I have pinned many ways that you can use these rekenreks in your classroom.
If you are using rekenreks in your classroom, I am using them this year for the first time and would love to hear how you use yours.