Mathematics questions database needed

Hi,

I am going to create a math puzzle / quiz game app.
So i need to prepare a database with questions and answers in different categories.
It's not related to studies like complex math solving.

Age group from 5 to 40 people can play this game to improve the math skills.

i have attached the sample images what i want. and it just a idea you can suggest too.

Start your bid with 60*60 = ? to ignore the spam bids.


Thanks all