Sometimes it is advantageous to express a value in round numbers. To round to a particular place, look at the digit immediately to the right of the one you want to round to, in this case, the tens place. If that digit is 4, 3, 2, 1 or 0, zero it and everything to the right of it out. If that digit is 5, 6, 7, 8 or 9, increase your target digit by one and zero everything to the right of it out. If your target digit is 9, it will become a zero and increase the digit to the left of it by one.
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400
3700
To round 5500 to the nearest hundreds place, we look at the digit in the hundreds place, which is 5. Since the digit to the right of it is 0, we do not need to round up. Therefore, 5500 rounded to the hundreds place is 5500.
If the hundreds are 5 and above, round up. Four and below, round down. 18,000
10000