Practicing arithmetic can be pretty frustrating at times for student and teacher. It is especially frustrating to know how to do something and repeatedly come up with wrong answers due to sloppy writing techniques.  The best tip I have received over the years was to use graph paper for multiplication and division.  (see example at the right)  This practice increased legability, technique, gradibility(?), and decreased frustration by 98%.  Each number had a spot and each column was clear for student and teacher.  Simple techniques like this can make the difference between a peaceful and stressful day of homeschooling.