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What the heck is Rekenrek?
Rekenreks are also known as an Arithmetic Rack. They are a great tool that allows children to develop number sense at their own pace. With the built-in 5 & 10 structure, they help children build number relationships that lead to more advanced strategies.
Why is it called a rekenrek?
The Rekenrek is a math tool created by Adrian Treffers at the Freudenthal Institute in Holland. Translated to English, Rekenrek means “counting rack”. The Rekenrek is composed of 20 beads in two rows of ten with five red and five white on each rod.
What’s the difference between a rekenrek and an abacus?
The rekenrek looks like an abacus, but it is not based on place value columns or used like an abacus. In- stead, it features two rows of 10 beads, each broken into two sets of five, much like the ten frames used in Bridges in Mathematics.
What is the difference between an abacus and a Rekenrek?
How does a math rack work?
A MathRack 20™ is composed of 2 rods with ten beads on each rod. Each rod is composed of 5 red beads and 5 white beads. (The five structure offers visual support because the “anchor number” five can often be visualized as a whole and a child can soon quickly see that 7 is just 2 more than 5.)
How do I introduce my Rekenrek?
Meet the Rekenrek: Begin by asking children what they notice about the rekenrek. Then introduce the ‘start position'(all beads over to the far right) and have them practice sliding beads in groups rather than one by one “Put your beads in start position.
How do you teach rekenrek?
What is the difference between rekenrek and abacus?
How do you show 16 on a rekenrek?
Kelly Move 6 beads on the top. Then the 10 on the bottom will make 16. Extension If you have a ten row rekenrek, challenge those students who are ready to represent numbers larger than 20.
How do you show numbers on a rekenrek?
•As an extension to the lesson, go back to the original list of numbers to be demonstrated. This time, ask students to show the numbers using both rows of beads – or two pushes of the beads. Flash cards may be used in this process: Show a number on a flashcard, and then ask students to represent that quantity on the Rekenrek.
How do students make 10 on rekenreks?
•Students should represent the first number on the top row, then pause. Next, they “Make 10” using the bottom row. At the pause, encourage students to lift their Rekenreks in the air to show their starting number. Teachers can quickly see if students are representing the first number correctly.
What is this rekenrek recording sheet for?
This Rekenrek recording sheet will help your students to record their thinking and move along the continuum.2 copies are included so you can easily print double-sided. Use this sheet to record your students work with rekenreks – with a space to write the number. Great practice for part-part-whole if your class uses MathRacks/Rekenreks!
What can I do with a rekenrek?
This worksheet is great to use with a Rekenrek or counters. Great tool for supporting students in mental math. This works well as a laminated sheet or inside a page protector to be used multiple times. This activity is a way to practice representing numbers with the rekenrek. Make addition and subtraction fun and engaging!