"Day" in Hebrew means ANY duration of time. The Christians know this.
Yes, but when used with numbers and articles, the term "day" means 24 hour day. See this article:
Missing Link
| Answers in Genesis
Peter said a YOM is a 1000 years to the lord.
Right. II Peter 3:8 "But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand years, and a thousand years as one day." So you see, if you finish the verse, the concepts kinda cancel each other out.
Don't get me wrong, I'm not trying to shoot down your idea of teaching this idea to the kids. Just don't leave these facts out when making your presentation.