Lattice multiplication is a big help for some students, though it will drive others up the wall. It is a good tool for them to try out, if nothing else.
If you do not know how to do lattice multiplication, there is a good worksheet with a short description of what to do at this website: http://www.superteacherworksheets.com/lattice/lattice2_TZBMZ.pdf. This is also a free file and does include several problems that have already been written.
I made this document so that students could use the tool during a test if desired without having to spend so much time drawing their own. It could also be laminated for use with a dry erase marker, though for a test I want to see their work in case they can secure partial credit.