Q:

Addition game with timer

A count down timer will display 20-s and a "start" button will be visible.
When the start button is pushed:
the "start" will change to "submit"
the timer will count down to 0 over 20 seconds.
the page will display random addition problems (single digit, plus single digit)
a text box will be available to type answers into and when you hit the "submit" button a new random problem will appear
This will repeat until the timer runs out at which time:
The page will display the number of attempted problems, the number of correct problems, and the percentage of correct problems.
The "submit" button will turn back into "start" and the page will be able to run again if you hit start again.

A:

Actually have a project I did for my wife/kids for their home schooling to drill their math facts. It doesn't have a count-down but it does time the assessments.
Feel free to check it out here: http://mathfactory.azurewebsites.net/#/
All the front-end code for it is here: http://mathfactory.azurewebsites.net/Client/Bundles/app-bundle.js

