Mathematics - Ratios and Proportions - Understanding ratios - Ratio Visualizer

Two groups of colored blocks (red and blue). Sliders adjust the count of each (1-20). The ratio updates in real-time showing: '3:5', 'for every 3 red, there are 5 blue', and as a fraction 3/5. Also shows: part-to-part (3:5), part-to-whole (3:8 and 5:8). The student experiments with different combina