Click here for more information about time that you ever knew existed!! Chronology  the Study of time 
Length is a measurement of distance or dimension. The two main systems to measure length are the metric and the English system. The metric system is based on 10 as you can see in the table below. The meter is the standard unit and portions of that are in tens. You can see the difference between a centimeter and a millimeter in the picture below. Always read a ruler in a direct line, not at an angle. 
Conversion Chart 1 centimeter = 0.3937 inches 12 inches = 1 foot 1 inch = 2.54 centimeters 1 foot = 0.3048 meters 3 feet = 1 yard 1760 feet = 1 mile 5280 feet = 1 mile 1 yard = 0.9144 meters 1 meter = 3.28083 feet 1 kilometer = 3281 feet 1 kilometer = 0.6214 miles 3 miles = 1 league 

In this class we will not be doing much conversion. Mostly because we will be using all metrics in our measurements. You can use the chart to the side to get an idea of how big each measurement is compared to what you are use to. 
measurement website where you can practice using a centimeter ruler. Measuring fish. 
is Far? 