[Joanna]

@chaley, thank you for so much your help! GPM does look much less confusing.

So now I am using your template for "Pages read" and a similar one for "Pages left":

program:
	progress = field('#progress');
	percent = divide(progress, 100);
	pagesread = multiply(field('#pages'), percent);
	test(progress, pagesread, '');

program:
	progress = field('#progress');
	left = subtract(100, progress);
	percent = divide(left, 100);
	pagesleft = multiply(percent, field('#pages'));
test(progress, pagesleft, '');

This works perfectly, with the exception of all books that have 1000 pages or more (regardless of whether #progress is empty or not). For those, I get a template error: invalid literal for float().

This has not worked right in my previous TPM template either. Not sure what the reason is, though.

There is also some problem with sorting: I've chosen sorting by numbers in the column dialog but now when I try to sort, nothing seems to happen.