There are a few things you could try to fix this:
Look for an app that's pausing and tap it. If it starts updating again, the others should do as well.
Tap one of the apps that are stuck on updating and try to make it pause. If this works, tap it again and see if it will resume.
Reset your iPad (press & hold Home & Power button until Apple logo appears).
Maybe there's an unfinished download in iTunes. Look there and if it is, let it complete first.
If this won't help, sign out of your account (App Store - Featured) and restart your iPad, then sign in again.
You could also try to delete the apps - if possible - and reinstall them afterwards, one by one.
If all this fails, update the apps in iTunes on your computer, then sync them to your device.