To determine Dean's errors, I would need to see the specific work or calculations he did to convert miles to kilometers. However, without seeing that, I can provide some common errors that people might make when converting miles to kilometers:
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Incorrect Conversion Factor: The correct conversion factor is that 1 mile is approximately 1.60934 kilometers. A common mistake would be using an incorrect figure, such as assuming 1 mile equals 1.5 kilometers or another incorrect number.
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Mathematical Errors: After using the correct conversion factor, mistakes could occur in the arithmetic (for example failing to multiply the distance in miles by the conversion factor correctly).
If you can provide the specific work Dean did, I can identify the exact errors.