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.
3700
400
If the hundreds are 5 and above, round up. Four and below, round down. 18,000
1000
1804
To the nearest hundreds it is 0.
151 round to the nearest hundreds place = 200
51,985 to the nearest hundreds = 52,000
300
3300
300
3700
400
1400
100
100
200