Can one say 打开书100页 or is it necessary to add 第 before 100?

I was thinking that it would be the difference between saying "open the book at/to page 100" (with 第) and "open the book 100 pages" (without 第, which sounds wrong to me).

  • 见1- 10 页 see pp。1- 10,把书翻到(第)十页 turn to p. 10,iciba has: Open your book and turn it to page 78 打开书翻到78页
    – user6065
    Mar 20 '18 at 21:56

First, '书' in '打开书100页'(open book 100 pages) can be omitted

Yes, if you omitted '第' in '打开第100页'(open page 100) and wrote "打开100页", the sentence could be interpreted as " open one hundred pages". For this very reason, 第 cannot be omitted.

  • If I don't omit 书 then 第 is obligatory either way? Mar 20 '18 at 21:55
  • 第 is obligatory, doesn't matter if you omit 书 or not
    – Tang Ho
    Mar 20 '18 at 22:16

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