Number lock on wireless keyboard

I have the compact wireless keyboard and have searched all over for a solution to turn on the numbers lock - if indeed such a thing is possible. The bootcamp documentation does not help either. It just says that for entering numbers the user should use the number keys just below the Function keys.

This means I have to hold down the shift key on my kb to enter numbers which is quite inconvenient for fast work within say, a spreadsheet.

I would be grateful for any help in this regard.
Many thanks