Directly translated, rekenrek means calculating frame or arithmetic rack.
It is a manipulative model used to help students generate a variety of addition and subtraction strategies, including doubles plus or minus one, making tens and compensation. The rekenrek looks like an abacus, but it is not based on place value columns or used like an abacus. Instead, it features two rows of ten beads, each broken into two sets of ﬁve.
Students can use the rekenrek to develop computation skills or solve contextual problems. Once children understand the operations of addition and subtraction, and can model various situations, it is important that they automatize
the basic facts by ﬁnding and using patterns and relationships. Unlike drill and practice worksheets and
ﬂashcards, the rekenrek supports even the youngest learners with the visual models they need to discover number relationships and develop automaticity.