It means to round up if the number is bigger than 5 and if the number is lower than 5 you round down
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4000
centi mean hundreds kilo mean thousands 564cm=56.4km
It mean describe the place that the number is in. For example you have 54,325, and you have to identify the place value for the three you would say the place value of the three is hundreds because it is in the hundreds place.
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If you mean 9 hundredths then 9/100 = 0.09 as a decimal