What is the difference between 27 centimeters and 27.00 centimeters?

When considering significant digits, there is a difference between 27 and 27.00. If you measured something that was 27, then it means you measured to the tens place. However, a measurement of 27.00 means you measured to the hundreths place. The 27.00 is a more accurate measurement because you are considering lower denominations of the unit.