As I was doing Kuya's Math worksheets for his exam tomorrow, I stumbled upon Dr. Math. It's a cool website that has a variety of Math questions ranging from Elementary through High School.
I was looking Math exercises for Kuya and saw Mad Math where he can practice addition, subtraction and multiplication online. Actually, it's a way to practice all basic Math skills so there are also problems in division.
The site is great because you can customize how many problems you can give and what problem types. you can also choose subtraction with negative difference and division with remainders.
I added it to my favorites. Kuya and I will be checking this site out frequently. This just saved me printer ink and paper. =)