A little tidbit about Rekenreks...
"Rekenreks originated in the Netherlands and have been widely used in other countries to help students reason about numbers, subitize, build fluency, and compute using number relationships (Fosnot and Dolk 2001). The rekenrek is composed of two rows of stringed beads with five beads of one color and five beads of another color on each row. They are colored in groups of five to help students "see" or subitize the quantity of five. The teacher has the option of using only one row of beads at a time to build fluency up to ten or using both rows to work on fluency with numbers up to twenty" (Parrish 2010).
Picture of a rekenrek:
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