Arithmetist is an ios app which helps practicing simple calculation multiplication, division, addition, subtraction with single digit numbers.
Tap the right solution. Each good solution will add one point two points will be dedcuted if wrong solution is selected.
After collecting at least 20 points the child can play a flappy bird like game. Catch the number showing the correct answer for the task.
You can purchase virtual goodies in the Starshop with the points you receive after solving the exercises.
The progress screen shows which exercises are difficult to solve and might need an explanation.
You can setup which operations and which numbers should your child practice, so they will not spend time with things they already know well.