To round the number 395,621 to the nearest ten thousand, follow these steps:
1. Identify the digit in the ten thousand place. For the number 395,621, this is '9' (since the ten thousand place is the second digit from the left).
2. Look at the digit to the immediate right of the ten thousand place to determine whether to round up or down. For the number 395,621, this digit is '5' (the number in the thousand's place).
3. If the digit in the thousand's place is 5 or greater, you round up the ten thousand place by one, and change all subsequent places to zero. If it is less than 5, you keep the ten thousand digit the same and change all subsequent places to zero.
- In this case, the digit in the thousand's place is '5', which means we round up.
4. Increasing '9' (the ten thousand place) by one results in '10'. However, since we only want to keep one digit for the ten thousand place, it results in 400,000. (Essentially, carrying over the rounding causes the next place to increase as well).
So, rounding 395,621 to the nearest ten thousand gives us 400,000.
Thus, the correct answer is 400,000.
