1. DO NOW! What do you know about mass and weight? Complete the chart on the top of the front page of your notes packet.

2. The International System of Units (The Metric System)

3. Review Metric system is based on powers of 10 Standard units in the metric system are meter, liter, gram Prefixes kilo hectodeca meter liter gram deci centimilli

4. The two methods of converting between units within the metric system include the ladder method (moving decimal place), and using conversion factors.

5. KILO 1000 Units HECTO 100 Units DEKA 10 Units DECI 0.1 Unit CENTI 0.01 Unit MILLI 0.001 Unit Meters Liters Grams Ladder Method How do you use the “ladder” method? 1 st – Determine your starting point. 2 nd – Count the “jumps” to your ending point. 3 rd – Move the decimal the same number of jumps in the same direction. 4 km = _________ m 1 2 3 How many jumps does it take? Starting Point Ending Point 4. 1 __. 2 3 = 4000 m Standard

6. The Conversion Factor Method The following are common metric system equations that can be used as conversion factors to cancel out units. 1 m = 100 cm 1000 mL = 1 L 1 kg = 1000 g 1 g = 1000 mg

7. Example: Using Conversion Factors How many milliliters are in 15.67 L of water? Given: 15.67 L of water Needed: mL of water 1000 1