Select a colour from the palette on the right, and paint on the grid. Repeat as often as desired — the Undo button will reverse the most recent action. The table below keeps count of the colours used. Type the resulting fraction, decimal and percentage for each colour directly into the blue cells, and click the Check Your Answers button to mark your work. (A double tick in the fraction column means the fraction is in simplest form.) Use the sliders to change the size of the grid, and if the Square button is selected, the values change in unison.