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. 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.
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1.67
It is still 2970 although, if you wanted to show that it was accurate to the nearest 100th you could write is as 2970.00
To the nearest hundredth 569 is 569.00
4,725.00
500