This is a convenient online ruler that could be calibrated to actual size, measurements in cm, mm and inch, the upper half is the millimeter ruler and centimeter .
Metric rulers have 30 cm and they are the larger measurement. A standard pencil is just about 1cm thick, and can be used to get a rough idea of the size of a .
How to read a ruler.. millimeters are 1/10th of a centimeter, if you measure 7 marks after a centimeter, it is 1.7 centimeters long.. Every mark is 1/8th of an inch.
Note: Measuring is a building block of math and understanding the world around us. This tutorial shows you how to measure an object in inches using a ruler.
On a metric ruler, each individual line represents a millimeter (mm). The numbers on the ruler represent centimeters (cm). There are 10 millimeters for each centimeter. To read a metric ruler, each individual line represents .10 (1/10) of a centimeter, or 1 millimeter.