Review the steps for long division here:

http://www.coolmath4kids.com/long-division/index.html

Practice addition, subtraction, multiplication and division at this website.  Use paper and pencil on the side  for figuring.  Put the number in the box and click the question mark box.  It will help you check your work. 

http://www.coolmath.com/0-math-practice-problems.html

Check the online links for "Math Man" and "Math with Larry" for explanations of "how to" on  daily math assignments.  This may especially be helpful when absent.