Most candidates can calculate when they have a quiet desk and a scratch pad. Interviews are loud. The clock is running. Interviewers watch how you think out loud when the numbers get messy.

The skill is not fancy math. It is staying structured under pressure: announce the setup, calculate in chunks, then land a so-what.

A 60-second pressure script

1. Setup: "I'll estimate revenue as price times volume, then check margin."
2. Chunk: calculate one piece, say the intermediate, then the next.
3. Sanity: "Does $40M feel right for a regional player?"
4. So-what: fact, meaning, decision in one breath.

Drill it three times this week

• Set a 3-minute timer.
• Pick one market-sizing or profitability prompt.
• No writing first. Speak the setup, calculate out loud, finish with a recommendation risk.

If you only practice silent worksheets, the interview will feel like a different sport.

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