Are you looking for extra help in teaching math to your students? Math A+Tube  has compiled tons of free videos which are subject based. You just go to the subject in which you want to dig deeper and watch the videos. There are also free worksheets you can print to practice the concepts. You will find resources for concepts such as addition, subtraction, measurements all the way up to Pre-Algebra and Algebra. This would be a great resource to bookmark for future reference on those days whey they are just not getting it.