Calculator frame for numbers of 20 red/white | RE-Wood® abacus counting frame slide rule

Beveled and therefore very stable design with stainless steel rods. Balls (Ø 1.3 cm) and frame made of RE-Wood®. (25x4.5x6cm) All sorts of things can be done with the balls in red and white arranged in steps of 5: numbers can be displayed or simply counted, "greater than, equal to or smaller" comparisons, all basic arithmetic, tens transitions, taking square and cube roots and much more. - Addition - counting with and without tens transition, subtraction - subtraction, multiplication - multiplication, division - splitting - distribution - Comparison of numbers (more-less), discovering relationships between numbers, use of technical terms (e.g. predecessor/successor, neighboring tens/neighboring hundreds, half/double of, multiples/dividers of) - Emphasis on the 5 and 10 structure - RE-Wood® consists of 100% recycled and natural materials, is PEFC certified and can be recycled again and again after use. - Manufactured in Bensheim/Hesse/Germany. Red White Red White