Planning a game scene

My plan for this game is to have it  based on multiplication and what I will have in my game is there will be a pet shop and there will be a lady who is wanting a dog but before that happends the player has to help the pet shop lady multiply all the animals and put them all in the right pen.After that the player will have to do some problems to unlock the combination to the door then you have to pay the money and count it then you get your dog.And you win he game and you did multipliation.