This is for all you iPad and iPhone owners?

I have owned an iPhone for the past 2 years. I just recently bought an iPad Air. (My first iPad). I set it up with my Apple ID that I used on my iPhone.
Now the problem is. I'm getting double notifications on both devices.
Sometimes when my iPad is off. My phone starts getting dual email notifications for the same email.

What do you iPad/iPhone owners recommend I do to stop this?

Added (1). Of course this is because I have the same apps on both devices. I guess I should have clarified that

All devices using the same Apple ID will do that. The only way to stop it is to have different apple ids on each.

That's how apple devices work. Most people want it to do that so they don't miss things like emails and iMessages if they don't have one device or another.

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