Fix Excel Spreadsheet Conversion Errors

I need assistance with fixing errors in 10 Excel spreadsheets where text needs to be converted to numbers in several columns. The data consists of 1500 rows, which have been reduced to 300 rows due to these issues. The main problem is the presence of non-numeric characters, specifically spaces or other delimiters, in number fields. I'm not entirely sure what caused this reduction in data.

Key Requirements:
- Identify and resolve non-numeric character issues in number fields.
- Convert text to numbers accurately to enable sorting by colors.
- Analyze and explain the reduction from 1500 to 300 rows.
- Ensure all data is consistent and correctly formatted.

Ideal Skills and Experience:
- Proficiency in Excel, especially in data cleaning and formatting.
- Experience with handling large datasets and troubleshooting data conversion errors.
- Strong analytical skills to determine the cause of data reduction.
- Attention to detail to ensure data integrity and accuracy.

Your expertise in resolving these issues will be greatly appreciated, and I look forward to your insights and solutions.