The 120-Bead Rekenrek Line makes number lines concrete and enables students to manipulate and visualize numbers. 120 beads on a rod with an elastic band inside to allow the rod to collapse and fold. Measures 4 ft. when unfolded. Fluently add and subtract within 100 using strategies based on place value. Details:Red and white beads4 ft. unfolded lengthRelationship between addition and subtractionProperties of operationsFor ages 6 to 9