This applet helps school children learn and practice basic arithmetic operations like Addition, Subtraction, Multiplication and Division.
LCM and HCF can also be practiced. At the end of the practice session (which lasts as long as you wish), you can see the score i.e. the number of problems correctly solved as well as the number of problems the child could not solve.
Unless the child gets a problem right, the applet does not advance to another problem. It is a great tool for teaching arithmetic.