[BucEyedPea]

I know s/g much better, and not noticeable.

1) Use your regular period, double-spacing, but use a font with a high x-height.
(that's the body of the type as in the lower-case letter x) these take up more room than fonts with narrower x-heights.

2) Add to this, if you can in the program you're using some wider spaces between characters. Usually it's called "kerning" when you remove spaces to make the text fit but when you add it's called "letterspacing." So add some wider letterspacing. Don't go hog wild, as it will get obvious and can be too hard to read if you do that. It really can add quite a few pages.

Heh! Heh! Heh!

Now if the teacher was smart they'd require the thing by number of words or characters instead of pages. BTW, I teach and require papers too. I can spot BS.