Q:
# When Measuring the Length of a Pencil Do You Use Mm or Cm?

**When measuring the length of a pencil, centimeters are used rather than millimeters because a pencil is more than a centimeter long.** Millimeters are used when measuring lengths that are less than a centimeter, such as a pencil's width.

When measuring the length of a pencil using centimeters, it is likely that the result won't be a whole number. For example, a pencil can be 18 centimeters and 9 millimeters long. For instances such as this, instead of using both units to express the length of the pencil, the excess length in millimeters can simply be converted to centimeters and added to the value in centimeters. This means 9 millimeters can be converted to .9 centimeters, and adding it to 18 centimeters results in a total length of 18.9 centimeters.

Choosing the appropriate unit of measure is important because using the wrong unit can result in a number that is either too large or too small, which makes it difficult to estimate a quantity's magnitude.

Learn more about Measurements-
Q:
## How Many Cm Are in a Mm?

A: There is one-tenth of a centimeter in a millimeter. Centimeters are one one-hundredth of a meter and millimeters are one one-thousandth of a meter; therefo... Full Answer >Filed Under: -
Q:
## How Long Is 181 Cm?

A: Since 1 centimeter is equal to 0.39370079 inches, 181 cm is equal to 71.2598 inches. It is also equal to 1.81 meters, 5.93832 feet, 1.979 yards and 0.00113... Full Answer >Filed Under: -
Q:
## How Long Is 171 Cm?

A: Equivalents of 171 centimeters are approximately 67.3 inches, 5.6 feet and 1.9 yards. Other equivalents are 1.71 meters and 1,710 millimeters. Inches, feet... Full Answer >Filed Under: -
Q:
## What Is the Equivalent of 184 Cm?

A: The equivalent of 184 centimeters is approximately 72.44 inches. Other equivalents include 1.84 meters, 1,840 millimeters, 6 feet and 0.44 inches, and 2 ya... Full Answer >Filed Under: