Students develop number sense and counting strategies using a virtual rekenrek (arithmetic rack). This tool features sliding beads for exploring numbers to 5, 10, or 20, supporting subitizing and mental math development. Supports TEKS K.2.A (count and represent numbers) and aligns with Common Core K.CC.A.1, K.CC.B.4.
Skills: counting, subitizing, addition strategies, number composition. Kindergarten level.