If you own a Windows Phone and have a young kid, I have some good news. I have recently released an application called Kidculator that I made for my 6 year old daughter, Anika. Like many parents, I suffer from this typical my-kid-should-be-a-geniusitis syndrome! After I shared it with her, I have found her playing with this application quite often and can vouch for the speed gains she has had. Okay, enough of sales pitch.
Try it and let me know your feedback. I am planning to add a lot more question types to this application.
Some salient features…
You can use the settings to set a specific question type you want to teach your kid.

Click practice.

You can set the maximum and minimum number based on your kids age and comfort level so that they don’t get intimidated by large numbers.
Once the kid is comfortable in practice mode, let them play and watch them beat their own records!
There are plenty of questions of choose from. And yes, a lot of them are coming sooner than you would imagine!
Have fun.
Rahul
Quote of the day: It is impossible to defeat an ignorant man in argument. - William G. McAdoo