Well, isn't that a happy little question! When we round 12,000 to the nearest thousand, we look at the hundreds place. Since the digit in the hundreds place is 0, which is less than 5, we keep the thousands place as it is. So, 12,000 rounded to the nearest thousand is still 12,000. Just a little rounding adjustment, no big deal!
12000
12000
12000
12000
12000
12000
12000
12000
12000
To the nearest ten, 12060 To the nearest hundred, 12100 To the nearest thousand, 12000 To the nearest ten thousand, 10000
12000
It is 0.