Hello!
To round a number to the nearest hundred-thousand, take every number after the first number in the sequence (in this case, it would be 5) and change it into a zero.
572,000 becomes 500,000.
Now, depending on the number after 5 (in this case, it's 7), we can determine whether 5 becomes 6, or if it stays the same. If the number that comes after 5 is greater than or equal to 5, then 5 becomes 6. Since 7 is greater than 5, 5 will become 6.
500,000 becomes 600,000.
600,000 is your answer.
But that was sort of confusing, right? No worries! Let's do an example problem.
Round 329,782 to the nearest hundred-thousand.
We'll start with changing everything behind 3 to a zero.
329,782 becomes 300,000.
Now, depending on the number directly after 3, it either stays the same, or becomes 4. If the number behind 3 is 5 or greater, then 3 will become 4.
The number behind 3 is 2. 3 stays the same. Your answer for this example problem is 300,000.