Where will I put the quotation in the sentence: I said that I might have left my book in Math class.

This sentence doesn't need quotation marks. It's an indirect, not a direct, quotation.

To properly place the quotation in the sentence "I said that I might have left my book in Math class," follow these steps:

1. Identify the exact words or statement that you want to quote. In this sentence, it appears that the statement you want to quote is "I might have left my book in Math class."

2. Decide whether you want to use a direct quotation or an indirect quotation. A direct quotation repeats the speaker's exact words, enclosed in quotation marks, while an indirect quotation paraphrases or summarizes the speaker's words without using quotation marks.

3. If you choose to use a direct quotation, place quotation marks around the statement you want to quote. The final sentence with the direct quotation would look like this: "I said, 'I might have left my book in Math class.'"

4. If you prefer to use an indirect quotation, do not use quotation marks. Instead, you can rephrase the statement as part of the sentence. The revised sentence with an indirect quotation would be: "I said that I might have left my book in Math class."

Remember to introduce the quotation with appropriate words such as "I said" or "I mentioned" to clarify that you are quoting someone else's words. Additionally, include any necessary punctuation, such as commas or periods, inside the quotation marks or at the end of the sentence as needed.