Do you own both an iPhone and iPad?

This is a question for all of you that own both an iPad and iPhone.
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. Of course this is because I have the same apps on both devices.
I know there's a setting somewhere that I need to be using on just one of the devices to stop getting notifications…
Any help would be greatly appreciated!

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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