THE METHOD
How this tool works
Choose a case, inspect its cells and units, then select a repair. The explanation shows the resulting financial check. Your latest result and attempt count are saved by error category.
Practice errors that change the answer
The cases cover references, omitted ranges, cash-flow signs, incompatible units, valuation adjustments and missing observations. Each exercise states the expected business logic so you can distinguish a modeling error from a different valid convention.
Start with the model question and unit labels before inspecting formulas. Then check whether references follow the intended time period, cash uses have the correct sign and totals include all required rows.
Use the financial check as well as the formula
A corrected formula needs a reasonableness check. In these exercises, that may mean reconciling revenue to growth, distinguishing debt from net debt or confirming that millions of dollars divided by millions of shares produces dollars per share.
The practice record shows your latest result and how many attempts you made. It is a learning record for these fixtures, not a certification or an automated audit of your own workbook.
WORKED EXAMPLE
A share-price unit error
An equity value of $240m divided by 20,000,000 individual shares incorrectly returns 0.000012 if the numerator stays in millions. Convert $240m to dollars first, or express both inputs in millions: the result is $12 per share.
Assumptions and limits
- All fixtures are original, simplified teaching examples.
- Excel-style formulas are shown as text and are not executed.
- The stated sign conventions and units apply to each individual case.
- No workbook upload, external audit or hiring-readiness score is provided.
Common questions
Can this check a spreadsheet I upload?
No. This tool provides eight curated practice models with known errors and worked repairs. It does not parse or certify arbitrary workbooks.
Why can a formula with no Excel error still be wrong?
A valid formula can use the wrong year, omit a cost, double-count debt or combine incompatible units. Excel syntax checks alone cannot verify the business logic.
What happens when I retry a case?
Your latest result replaces the previous result for that fixture, and the attempt count increases. You can revisit any case or reset the saved practice record.
Sources and methodology
Reviewed November 6, 2026. Sources support the method described above. Examples are illustrative; results depend on your inputs and require your review.