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Basic metric units and conversions

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- 1. Metric Conversions H.León’s Grade 8 Science
- 2. <ul><li>There are many different measurements that we can take. We can measure mas, volume, distance, pressure, etc… </li></ul><ul><li>When we give a measurement, we give a number AND a unit. </li></ul><ul><li>For example: “I am 135 cm tall.” “I am 5 feet tall,” “I am 1.35 m tall.” </li></ul><ul><li>Can you point out the units? </li></ul>Metric Conversions Notes
- 3. Metric Conversions Notes <ul><li>In Canada, we use the Metric System for Measurement. </li></ul><ul><li>The following are examples of metric units and what they measure: </li></ul>t Time seconds s F Force newtons N P Pressure pascales Pa V Volume cubic metres m 3 V Volume litres L A Area metres squared m 2 M Mass grams g D Distance metres m Symbol It Measures Unit Name Unit
- 4. Metric Conversions Notes <ul><li>Metric Units can be attached to prefixes to refer to larger and smaller amounts. </li></ul><ul><li>For example: Instead of a recipe asking for 0.005 L of vanilla, it can ask for 5 mL </li></ul><ul><li>What is the difference? </li></ul><ul><li>What is the prefix? </li></ul><ul><li>Which would you use to buy milk? L or mL? </li></ul>
- 5. Metric Conversions Notes <ul><li>Here is a way to remember metric prefixes: </li></ul>Stands for… And is symbolized as… Metric Converting Dead Over Dropped Henry King mili- centi- deci- deca- hecto- kilo- m- c- d- da- h- k-
- 6. Metric Conversions Notes <ul><li>These prefixes can be added to many metric units: </li></ul>m- c- d- da- h- k- mPa Pa daPa cL L g hg dm m Km Pa L g m
- 7. Metric Conversions Notes <ul><li>Lets add numbers to that chart. </li></ul><ul><li>If I buy 4000 mL of milk, it means I am buying 4L </li></ul>400 cL 40 dL 0.4 daL 0.04 hL 0.004 kL 800 cL 80 dL 0.8 daL 0.08 hL 0.008 kL <ul><li>Do you see a pattern? </li></ul><ul><li>Now guess what the missing values would be: </li></ul>4000 mL 4 L m- c- d- da- h- k- 8000 mL 8 L m- c- d- da- h- k-
- 8. Metric Conversions Notes <ul><li>How about if we start at a different place. Can you still complete the pattern? </li></ul>250 000 cg 25 000dg 250 dag 2 500 000 mg 2.5 kL 2500 g 25 hg m- c- d- da- h- k-
- 9. Metric Conversions Notes Metric Conversions Notes <ul><li>Notice that the number of “conversion jumps” from centimitres to metres… </li></ul>… Is the same number of “decimal jumps” and in the same direction. 85 cm = 0.85 m km hm dam m dm cm mm … and some times you have to fill in the zero’s
- 10. Metric Conversions Notes <ul><li>Notice that the number of “conversion jumps” from litres to mililitres… </li></ul>… Is the same number of “decimal jumps” and in the same direction. 4 L = 4000 mL kL hL daL L dL cL mL … and some times you have to fill in the zero’s
- 11. Metric Conversions Notes Metric Conversions Notes <ul><li>Notice that the number of “conversion jumps” from centimitres to metres… </li></ul>… Is the same number of “decimal jumps” and in the same direction. 9.5 g = 0.0095 kg kg hg dag g dg cg mg … and some times you have to fill in the zero’s
- 12. So remember: King Henry Dropped Over Dead Converting Metric

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