Round to the nearest ten thousand: 68,231 a. 69,000 b. 70,000 c. 68,000 d. 60,000

The number 68,231 is closer to 70,000 than it is to 60,000

So the answer is choice B

Another way to see this answer is to drop everything after the 6 (which is what is in the ten-thousands digit place) and replace all of those dropped digits with 0s. We add 1 to the digit we didn't get rid of because the 8 after the 6 is larger than 5