Answer :

To round 89,139 to the nearest ten thousand, follow these steps:

1. Identify the digit in the ten thousand place: In the number 89,139, the digit in the ten thousand place is 8.

2. Look at the digit in the thousand place: The digit in the thousand place is 9.

3. Apply rounding rules: If the digit in the thousand place is 5 or greater, round up the ten thousand place by one. Since 9 is greater than 5, we need to round the number up.

4. Round the number: Increase the digit in the ten thousand place (which is 8) by 1, making it 9. Change all the digits to the right of the ten thousand place to zeros. Therefore, 89,139 rounded to the nearest ten thousand is 90,000.

This means the rounded number is 90,000.