This site helps you learn new words while raising money for charity at the same time. It self-adjusts to your vocabulary level. If it starts out too hard, it will adjust lower as soon as you start trying.
Number Invaders - Multiplication and Division
The Number Invaders are descending upon the innocent inhabitants of a distant planet. Help Trevor keep the Number Invaders a safe distance away. You'll need instant recall of math facts and a steady hand to win this game! A section of Math Playground's site.
Destroy the ghosts by typing the words and numbers shown on them. Simply use your keyboard and type as quickly as possible to cast away the ghosts, or they will approach and claw you.
Has some pop ups. Can be downloaded onto your computer.