Lesson 1: Length T. Trimpe

Metric System: Decimal system based on ten (10) When compare to the standard system, it is much easier to use and convert. IE – Standard System How many inches are in a mile? Multiply 12 inches x 5280 feet = IE - Metric System How many cm in a km? Multiply 100 x 1000 Easier = 100,000 cm = 1 km. How? Move decimal 5 spaces to the right Who uses the Metric System? Most of the countries in the world. USA is starting to use the metric system slowly. IE – Soda containers, weights, length… many products have both standard and metric measurements. IE – Near borders of USA, mile markers change to km.

Units in the Metric System: Meter = length Liter = volume, usually used with liquids Gram = mass, similar to weight Prefixes in the Metric System: Milli =1/1000 = m Centi = 1/100= c Deci = 1/10= d 1 Deka = 10= da Hecto = 100= h Kilo = 1000= k Metric Graph k_______h_______da_______UNIT_______d_______c_______m /10 1/100 1/1000

English vs. Metric Units Left Image: Right Image: Which is longer? A. 1 mile or 1 kilometer B. 1 yard or 1 meter C. 1 inch or 1 centimeter 1.6 kilometers 1 mile 1 yard = meters 1 inch = 2.54 centimeters

Metric Units The basic unit of length in the metric system in the meter and is represented by a lowercase m. Standard: The distance traveled by light in absolute vacuum in 1⁄299,792,458 of a second. Metric Units 1 Kilometer (km) = 1000 meters 1 Meter = 100 Centimeters (cm) 1 Meter = 1000 Millimeters (mm) Which is larger? A. 1 meter or 105 centimeters B. 4 kilometers or 4400 meters C. 12 centimeters or 102 millimeters D millimeters or 1 meter Click the image to watch a short video about the meter.

Measuring Length Ruler: How many millimeters are in 1 centimeter? What is the length of the line in centimeters? _______cm What is the length of the line in millimeters? _______mm What is the length of the line to the nearest centimeter? ________cm HINT: Round to the nearest centimeter – no decimals. 1 centimeter = 10 millimeters