I think this is the most interesting expression from this tutorial. It is simple and effective.
By using time as a driver of the animation, we don’t need any keyframes. By multiplying this value with number containing decimals, we get numbers with lots of values behind decimals.
Final part is using ‘x= ‘ to add extra information to the number. This part can be changed to produce values like $ or even full words.
To finish this off, we are simply “clamping” the final value to 4 decimals. Simple and effective.