Learning Resources Mini 100-Bead Rekenrek (Set of 25). The compact Mini 100-Bead Rekenrek is ideal for when pupils are working at their desks learning about number sense and relationships for numbers greater than 20. This compact, durable maths tool has a sturdy wooden frame, and 100 colour-coded wooden counters. Colours change at 50, highlighting that 100 is composed of 2 sets of 50. Measures 23cm H x 15cm W. Includes Activity Guide. Ages 3+.