20 Arithmetic Bead String by Wissner features 20 red and white beads divided into groups of 5. The bead string is a fun way to teach children how to count. The pack of 10 arithmetic bead strings are perfect for educators. The string is approx. 45cm and is tearproof, stretchable string. When pulling the string, the slight ball lock lifted and all beads slide back together again. Each plastic bead has a diameter of 1cm and therefore the bead string can be used as a tool to measure. Age 3 – 10 years 20 Arithmetic Bead String by Wissner is an educational product and not a toy. It is packaged in a bag. Not safe for under 3 years. The string is black not white as shown in the photo. Educational Benefits: count forwards and backwards from 1 to 20 grasp quantities at a glance decompose quantities (7 decomposed into e.g. 5 and 2) count in steps (e.g. 2, 4, 6, … or also 17, 15, 13, …) even or odd numbers, neighboring numbers compare numbers (>, < or =) Add (plus) and subtract (minus) numbers in the range up to 20 multiplication / division (doubling / halving) use 5’s and 10’s structure use as a measuring tool
