iPad typing numbers show up

That has to do with Key Flicks. If you are swiping the Y key, you notice the 6 on top of it? If you are not tapping down straight, it can type the number. All of the keys that have a grey letter or number character above them will do that. You can turn off Key Flicks in Settings to remove those additional characters. Go to Settings>General>Keyboards>Enable Key Flicks and turn that Off.

You're welcome. Enjoy your device. I must admit that it can be helpful if you don't want to move back and forth from the letter screen to the number screen, but if you are trying to type really fast, it can be a pain, as you so easily discovered.