Guide
History
The history section keeps track of your past calculations. This will enable users to have an easier and friendly way of solving and track long mathematical problems
Using history to reselect
You can click or tap on any elements to add to your current calculation. It allows you visualize previous results so you can input them into your next problem. However, you cannot reselect decimals ,any value with a decimal, or any negative numbers. This might be added in the future
Single and whole digits
Using 
or the hotkey Q, the numeric values can be reseelected in the history section as separate digits or as a whole.
Above: The single digit selection is enabled, allowing us to reselect previously used numbers in single digit form.
Above: The whole number selection is enabled, allowing us to select previously used whole numbers.