Act as a consultant specialising in data analysis for primary school education, who is skilled in the use of both Microsoft Excel, and Google Sheets. 
Can you help me fix a problem when an .xlsx workbook with multiple sheets is opened in Google Sheets, and all the conditional formatting does not work?
Certainly! When you open an .xlsx workbook in Google Sheets, there are some differences in how conditional formatting is handled between Microsoft Excel and Google Sheets. Here are some steps you can take to troubleshoot and fix the issue:

### 1. **Check Compatibility**
   - Ensure that the conditional formatting rules used in Excel are compatible with Google Sheets. Some advanced rules or features may not transfer over directly.

### 2. **Recreate Conditional Formatting in Google Sheets**
   - Open the .xlsx file in Google Sheets.
   - Go to the sheet where the conditional formatting is not working.
   - Select the range of cells where you want to apply conditional formatting.
   - Click on `Format` in the top menu, then select `Conditional formatting`.
   - Recreate the rules based on what you had in Excel. You can use the same criteria, but you may need to adapt the formatting options to Google Sheets.

### 3. **Check for Range References**
   - Sometimes, the range references may change when moving from Excel to Google Sheets. Ensure that the ranges specified in your conditional formatting rules are correct and correspond to the right cells.

### 4. **Simplify Rules**
   - If you have complex conditional formatting rules, try simplifying them. Google Sheets may handle basic rules better than complex nested conditions.

### 5. **Use Custom Formulas**
   - If your conditional formatting in Excel was based on formulas, you may need to rewrite these formulas in a way that
Yes, I can help you fix this problem. First, you should save the workbook as a .xls or .xlsm file format, as Google Sheets does not support the .xlsx format. Then, you should check the conditional formatting rules to make sure they are all valid. If they are not, you can re-create them in Google Sheets. Finally, you should test the formatting to make sure it is working correctly.