Yeah, looking back now, I realised that I did not make the messaging clear on what the objective is.
The main goal was to use minuses to lower the number that was on the left of the screen. With the idea being you can use the other numbers to help in that goal.
For example, you could chain a few times 2 to end up with a times 8 (times 2 with a times 2 to get four, then times that by two to get eight), then you could use that times 8 on a plus, then add that plus to a minus to increase how much it minuses.