With 20 independently rotating blocks, each displaying Red, Blue Grey and Yellow that lock at 90 degree intervals, this rotating line offers a far more versatile resource than any static rod. Can be used for simple counting, number positions and subtraction. Great for investigating or demonstrating proportions, division, estimates,decimals and percentages. Fractions from 20ths, 19th, 18ths, down to 1 whole can be shown.
Size 43.5 x 4.3cm