Astro Blaster is a fun game that helps students practice rounding numbers, or estimating sums or differences. Players can also practice arithmetic. Shot the asteroid that correctly answer the question seen at the top of the screen. Hitting the asteroid with the alien on it deducts points from your score. Hit the white rocket with the black nose cone for extra time, and the alien space ship for bonus points.
Disclaimers: Some parents may not like the shooting of the rocket or the spaceship. Lastly, this game requires Flash.