What is a rekenrek in math?

What is a rekenrek in math?

A Rekenrek is an arithmetic frame designed to help students visualize addition and subtraction strategies. Students focus their learning on groups of 5 or groups of 10 up to 100. The Rekenrek combines features of the number line, individual counters, and base-ten models such as Base Ten Blocks.

What is the difference between an abacus and a rekenrek?

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.

How does a rekenrek help students?

The Rekenrek provides a visual model that encourages young learners to build numbers in groups of five and ten, to use doubling and halving strategies, and to count-on from known relationships to solve addition and subtraction problems.

When were Rekenreks invented?

The Rekenrek Freudenthal (1991) advocated for a constructivist model for mathematics education similar to the one adopted by the NCTM (2000). Adrian Treffers, a math- ematics curriculum researcher at the Freudenthal Institute in Holland, developed a manipulative called rekenrek (Fosnot & Dolk, 2001).

Where can I find learning to think math with the rekenrek?

Jeff Frykholm, Ph.D. Learning to Think Mathematically with the Rekenrek A Resource for Teachers, A Tool for Young Children by Jeffrey Frykholm, Ph.D. Published by The Math Learning Center © 2008 The Math Learning Center. All rights reserved. The Math Learning Center, PO Box 12929, Salem, Oregon 97309.

How do students represent numbers on the rekenrek?

When we ask students, for example, to represent the number 9 on the Rekenrek, they are apt to use informal partitioning strategies of one kind or another. For example, we might expect students to model the following reasoning:

How do I use the rekenrek for demonstration?

•Begin a demonstration by sliding 5 red beads to the left. Ask students how many beads were moved. After discussion, return the beads to the left side of the Rekenrek.