The standard launcher that comes with the N7 has 5 home screens, with the middle of the 5 being the default screen when you hit the home button twice. Move your widget to this screen by touching and holding it, then dragging it to the desired location.
If you install an alternate launcher, like Nova Launcher Prime, you can add and subtract home screens to your liking, and also rearrange the order of the screens. In this way, you don't need to move individual widgets if you don't want to, but an entire screen to a new location, including the middle location, which is the default home screen.