Showing GM Roll to Players?

Is there a way to either show an already rolled GM result to players, or is there a way to default NPC rolls to show to players? (Specifically, in the Lost Mine of Phandelver, if I click on any of the monster attacks, none of my players are able to see the results.)
Not really. You can change all your npc's to show their rolls however.
The Aaron
API Scripter
I know you can change the default on the character sheet for OGL: This is on the Game Settings page. I don't know if that will change the existing characters.