Play game Math Dog Integer Addition by MathNook on this site available for free of cost, please share it with your friends.
About Math Dog Integer Addition game:
Help Math Dog, AKA MathPup, catch the cat burglar. All you need to do is figure out the answer to the integer addition problem containing both positive and negative numbers. 3 skill levels to choose from and you can choose to play untimed for a leisurely game or select timed mode for more of a challenge.