How do I Sync notes between iPad and iPhone.

The next step would be to restore. Which device has the correct notes, or should I say, the most current? If it is the phone, turn Notes off for iPad, tell it not to save. If the phone is the latest list, then turn on Notes for the iPad and see if it will populate correctly.

No, I was going to have you try something else before you restore. I would hate to have to go that far. Make sure the iPad is connected to wi-fi and turn Notes off in iCloud. It should prompt you about saving the Notes on the iPad, say no. Power cycle the iPad, then turn Notes back on for the iPad. It should bring the Notes over from the phone.

When I mentioned signing out of iCloud earlier, did you sign out on both devices? If you did not sign out on the iPad, try that now, and then sign back in. Otherwise, I've run out of ideas. You may either wait to see if someone else has an idea, or you can contact Apple Support for assistance. You may be better off with a Genius Bar appointment since telephone support could cost if you have had the iPad for a while.

If the iPad and the iPhone are signed in with the same iCloud ID, all you have to do is turn on Notes in iCloud in Settings. That will sync them together on both devices.

Try signing out of iCloud and signing back in again. I've not experienced any problem with mine. See if any of this helps. iCloud: What is iCloud Notes?

On the iPad, or it didn't work?

It sounds like you may not be logged into iCloud on the iPad. Are you sure it is logged in, and is there an active internet connection on it?