The tool opens showing a fraction in bar form. Click the ‘Show fraction’, ‘Show percentage’, ‘Show decimal’ or ‘Show ratio’ buttons to reveal what this fraction is when written in these various forms. Click again on any button to hide this information once more.

To alter the numerator of the fraction, either click on parts of the bar, or click the top pair of arrow buttons next to ‘Show fraction’. Use the lower pair of arrow buttons to alter the denominator.

Clicking ‘Set up’ opens a menu in which you can display up to 3 more fractions, and display them in circular form (including using a pizza or cake background image if wished) or in grid form (including a chocolate bar background if wished).

Clicking Reset undoes all changes you have made, returning the tool to its default state.