70-80 sheets U.S. / 140-160 pages in Canada

 

What's the difference between sheets and pages?

In the U.S., notebook size is usually listed in sheets, which are actual sheets of paper. In Canada, notebook size is listed in pages, numbered like a book, with 2 pages per sheet of paper.

So a notebook numbered by pages needs to be double the number of a notebook numbered by sheets, so that the notebooks are a similar size.