It works. I pulled power jumper on Proto module and hooked arduino pin 11 (I have headers installed) to the output side of the Proto power pins. With the proto module on d5 then the number module, I can turn the number module on/off by setting pin 11 HIGH/LOW.
If you use D1, you'll need a second proto module to jumper D1 signal pin to power pin on other Proto module.
Since max pin sourcing for arduino pin is 40 ma, you probably don't want to string a bunch of other modules after the number module.
(transistor might work as well, though there is a voltage drop when the transistor is on, but should be enough to power the number module ... of course you need a breadboard and headers on arduino or D1 + 2nd proto module. you wouldn't need to worry about sourcing too much power from arduino pin)