Great online tutorials are available at Khan Academy. I usually just do a Google search of "khan academy multiplication" for instance, or you can sign up at their site. https://www.khanacademy.org/ (link is at left)
Kenken puzzles are a wonderful way to play with Math. Their free site is at:
http://www.dictionary.com/fun/kenken (link is at left)
Want to see how things can go horribly wrong if someone decides "I hate Math"? Even the easy questions become unbelievably hard. See the link to the left.
Grocery shopping becomes a useful Math lesson when you talk about budgeting, menu-planning, money and comparison shopping.
Baking is a perfect way to make Math authentic - there is nothing like using a recipe (and eating cookies) to make fractions, multiplication and division fun.
Battleship is a wonderful game for learning Coordinate Grids.
Chess teaches strategic problem-solving.
A weekly allowance teaches money management - talk to the kids about money, and bills, and mortgages and rent - they will thank you later.
Baseball stats? Fun Math!
Remember - Math is a whole lot of fun when it is real.