Your question is Handling Pressure in Mental Math. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Tell me about a time you were asked to make a quick quantitative estimate under pressure, got it wrong or nearly wrong at first, and then recovered. Walk me through how you communicated your thinking, corrected yourself if needed, and what you learned from that experience.