Through this activity, students can begin to understand situations that entail multiplication. They are able to fill out the squares and see the relationship between numbers that are being multiplied together.
Tarsia Jigsaw Files for Free from MrBartonMaths.com. I use these in my Algebra & Geometry classes but suitable for all ages. To download the free program, go to http://www.mmlsoft.com/index.php?option=com_content=view=11=12 Scroll down to Formulator Tarsia and download the first program under that heading. Lots of puzzle on this site and on http://www.skillsworkshop.org/ or make your own.