Because they are smaller units of measurement.
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150 millimeters squared is more.
There are 10 millimeters to every 1 centimeter. So, there would be more millimeters in a given length than centimeters. To increase a number you would multiply.
One centimeter is exactly 10 millimeters. Therefor, 45 centimeters is exactly 450 millimeters. Both are the same.
The reason that you can be more precise while measuring in millimeters is because millimeters are smaller than centimeters, therefore you can make more specific measurements. +++ 1m = 100cm and 1cm = 10mm. The cm is not a 'preferred unit' in SI scales.
Yes.