Order math DVDs that cover the particular area of math lessons needed. Adult math videos are sold by a number of organizations for use with courses or in-home study.
Watch each lesson individually to avoid cluttering your mind with scores of math facts in one sitting. Follow along by writing and calculating the problems and examples on paper with pencil. Watch two lessons a week and practice the skills you've learned between each lesson.
Repeat all lessons that are not completely clear to you. Watch the same lesson until you have an expert understanding of the concepts and calculation methods explained. The professors who record these lessons attempt to present them in a way that adults learning math can understand.
Repeat the entire series of math DVDs every six months to a year to avoid forgetting the lessons.