In order to avoid plagiarism in a speech, you must inform the audience of the author or origin of any information that is not common knowledge arrange information into your own words always present information in direct quotes include the page or reference number of a source

Inform the audience of the author or origin of any information that is not common knowledge.

Explanation:

It would be hard to directly quote, during a speech, the pages or reference numbers of a source and not lose the audience's attention, not to mention that, if it's common knowledge, they may think that are being made look like fools.

This way you can quote authors and ideas or references whilst having a smooth speech.

The other option, arranging information in your own words, is plagiarism.

you need to include the text. we have no idea what you are referring to

at hatfield elementary school, there are 504 students in 7 classes. each class has the same number of students. what is a good estimate of the number of students in each class?