open your book at page 9 vs open your book on page 9

Examples:

• Open your book at page 50 to find the exercise questions.
• Please open your book at page 25 for the next chapter.
• I found the answer key at page 10, so open your book at that page.
• The important diagram is on page 7, so open your book at that page.
• Open your book at page 100 to see the conclusion of the story.

Alternatives:

• Turn to page 9 in your book.
• Go to page 9 in your book.
• Find page 9 in your book.
• Refer to page 9 in your book.
• Look at page 9 in your book.

Examples:

• Open your book on page 50 and read the first paragraph.
• Start your assignment on page 25 of the book.
• The story begins on page 10, so open your book on that page.
• You can find the introduction on page 7, so open your book on that page.
• Open your book on page 100 to begin the next section.

Alternatives:

• Start reading from page 9 in your book.
• Begin on page 9 in your book.
• Commence at page 9 in your book.
• Start working from page 9 in your book.
• Begin your task on page 9 in your book.