Answer:
The correct answer is B. 30.
Step-by-step explanation:
538 - 509 = 29
Since we need to round this to the nearest tens place, that means we need to round it to 10, 20, 30, etc.
When rounding a number, you look at the last number in it. If it is a 5 or higher, you round up the number before it by 1. If it is a 4 or lower, the number before it stays the same and the lowest number turns into a 0.
Since 9 is higher than 5, the 2 in 29 will turn to a 3, and the 9 will turn into a 0.
Therefore, the correct answer is B. 30.
Hope this helps! :D
