1. Round the number $86,500$ to the nearest ten thousand. The result is ___.
2. A company manufactured $438,200$ toys last year. Round this number to the nearest hundred thousand. The rounded number is ___.
3. When rounding $65,000$ to the nearest ten thousand, what is the result?
4. When rounding a number to the nearest hundred thousand, the endpoints are $300,000$ and $400,000$. What is the midpoint used for rounding?
5. A stadium has a capacity of $37,900$ people. Rounded to the nearest ten thousand, the capacity is ___ people.
6. Round the number 86,450 to the nearest ten thousand. The result is ___.
7. What is 439,812 rounded to the nearest hundred thousand?
8. Estimate the sum of 309,880 and 475,120 by first rounding each number to the nearest hundred thousand. The estimated sum is ___.
9. On a number line used to round to the nearest ten thousand, what number is exactly halfway between 120,000 and 130,000?
10. A number is written as 5_,210. When rounded to the nearest ten thousand, the result is 50,000. What is the largest possible digit that can go in the blank? ___