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Double-check a number or calculation
Works with ChatGPT · Claude · Copilot
What you’ll be able to do
You can verify a figure AI gave you instead of trusting it on sight.
The problem
AI can make arithmetic and unit mistakes that look correct.
What this skill does
Ask AI to show its steps and recompute a different way.
When to use it
- Whenever a decision depends on a number AI produced.
Juni’s tip
Numbers feel solid but can be wrong. Make AI show its work.
The prompt
Main prompt
Show me step by step how you got [result], then recompute it a different way to check. Problem: [paste numbers]
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Try it live
Fill in the blanks — your ready-to-use prompt builds as you type.
Your prompt
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Weak vs. better
✗ Weak prompt
Is this math right?
✓ Better prompt
For the problem below, show each calculation step, state the units, then recompute a second way and compare. Problem: [paste numbers]
Why this works
Showing steps and recomputing a second way catches the silent math errors.
Practice task
Try it now
Take a number AI gave you and ask it to show and recheck the steps.
Self-check
- The steps and units are shown, not just the answer
- A second method gives the same result
Common mistakes to avoid
- Trusting a number with no working shown.
- Ignoring units, so the figure is off by a factor.
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