There are 10 milimeters in 1 centimetre. The numbers on a ruler are usually centimeters. The little un-numbered lines that divide up the centimeters mark the milimeters.
An english ruler uses inches and feet, and a metric ruler uses centimeters, millimeters, decimeters and meters.
A ruler ?
If the ruler only has inches and millimeters, just use the millimeters side. Remember, there are 10 millimeters in 1 centimeter.
An ordinary ruler.
A metric ruler
inches, centimeters and millimeters
A ruler typically measures length in inches or centimeters. If a ruler is marked in inches, 0.2 inches would be represented by a distance of about 5 millimeters (mm) on the ruler, as there are 25.4 millimeters in an inch. If the ruler is marked in centimeters, 0.2 centimeters would be represented by a distance of about 2 millimeters on the ruler. It's important to note that not all rulers will have markings for every increment, and the accuracy of the ruler may also affect the exact measurement.
A normal metric ruler!
15.25 cm on a ruler is located at 15 centimeters and 2.5 millimeters.
A ruler is usually divided by: inches, centimeters, and millimeters.
a straightedge need not have measuring increments (inches, centimeters, etc.) while a ruler is a straightedge with measuring increments
Usually centimeters...the smaller ones are millimeters. To judge, there are 2.54 centimeters in an inch.