Apple Pages '09 - Manual (Page 175)

Chapter 7 Working with Images, Shapes, and Other Objects 175
3 Double-click the equation and type the equation you want, using the MathType 6
application window and tools.
Refer to MathType 6 Help for specific instructions on how to use this product.
4 When you’ve finished typing your equation, choose File > “Close and Return to Pages,”
and then click Yes in the window that appears to save the equation.
5 Drag the equation to wherever you want it on the page.
After you’ve closed MathType 6, Pages treats the equation as an object that you can
reposition, resize, reorient, group, layer, or even mask like an image. However, if you
mask the equation, you must unmask it in order to edit it further.
6 To edit the equation, double-click it to open MathType 6 again.