Click here to play some decimal place value or addition games. (Don't play the subtraction games, yet.)
Go to this math problem. Work through solving it on your own. Try to think "outside of the box" and come up with a quick(er) way to solve.
(Remember, the question is asking what digit would be in the ones place value -- NOT the entire number. If you keep this in mind, you'll be likely to solve it more easily.