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The Metric System

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**Mini- WebQuest When was the Metric System or SI units established?**

Which scientists helped design the Metric System in use today? Find and list the countries that are NOT using the Metric System?

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**WHY DO WE USE THE METRIC SYSTEM?**

Almost all other countries are using the metric system Other countries’ companies are refusing to buy products from the U.S. if not labeled in metric units Scientists need a universal way to communicate data (SI Units)

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**APPROXIMATE CONVERSIONS BETWEEN METRIC & US LENGTH UNITS**

A meter is about the same length as a yard A meter is about three feet long A decimeter is about four inches long An inch is about 25 millimeters A foot contains about 30 centimeters A foot contains about 3 decimeters

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**WHAT DOES THE METRIC SYSTEM MEASURE?**

In the metric system there are 3 base units: Meter Liter Gram The gram measures mass What is mass?? The liter measures volume What is volume?? The meter measures length What is length??

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Metric System The base units can stand alone or a prefix can be added to the front Example: centi + meter = centimeter The prefixes we will use most in this class are: Kilo- Centi- Milli-

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**Metric System Ladder Kilo- Hecto- Deca- meter gram liter Centi- Milli-**

Base Units meter gram liter Deci- Centi- Milli-

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**THE METRIC CONVERSION CHART (LADDER METHOD)**

To convert to a smaller unit, move decimal point to the right or multiply. Kilo- Hecto- Deca- Base Units: Gram Meter Liter Deci- Centi- Milli- To convert to a larger unit, move decimal point to the left or divide

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**TRY THIS USING THE LADDER METHOD**

1000 mg = ______ g Step 1: Determine if you are going to go up or down the ladder. Step 2: Determine how many steps there are from milligrams to grams. Step 3: Move the decimal point the amount of places that was determined in steps 1 & 2.

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**TRY THIS USING THE LADDER METHOD**

1 L = __________ ml 50 kg = ____________ g 200 m = ____________ km

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