Measurement1mar10

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Measurement1mar10

  1. 1. Mental Math <ul><li>You’ve been trapped alone in the jungle. A helicopter can pick you up in 45 minutes. You don’t have a watch and can’t arrive early or late otherwise jungle lions will eat you. There is hope!!! Each of your shoe laces burn for exactly one hour if you light one at one end. The laces burn at variable rates throughout the lace. How can you time 45 minutes and escape to freedom? </li></ul>
  2. 2. Measurement “ The memory of misery approaches zero as the memory of joy approaches infinity”
  3. 3. Introduction <ul><li>History </li></ul><ul><ul><li>The Egyptians and the royal cubit </li></ul></ul><ul><ul><ul><li>The pyramids </li></ul></ul></ul>
  4. 4. The Greeks and the fathom <ul><ul><li>War ship lengths </li></ul></ul><ul><ul><li>What is the problem with these measurements? </li></ul></ul>
  5. 5. Metric Units <ul><li>Common Units of Measurement </li></ul><ul><ul><li>Millimetres (10 per centimetre) </li></ul></ul><ul><ul><li>Centimetres (100 per metre) </li></ul></ul><ul><ul><li>Metres (1000 per Kilometre) </li></ul></ul><ul><ul><li>Kilometre (Notice a pattern?) </li></ul></ul>
  6. 6. Conversion Factor <ul><li>The conversion factor of metric distances occur in multiples of ten. </li></ul><ul><li>However there is also the: </li></ul><ul><ul><li>Terametre </li></ul></ul><ul><ul><li>Gigametre </li></ul></ul><ul><ul><li>Megametre </li></ul></ul><ul><ul><li>Hectometre (hm) </li></ul></ul><ul><ul><li>Decametre (dam) </li></ul></ul><ul><ul><li>Decimetre (dm) </li></ul></ul>
  7. 7. The Stairs <ul><li>There is a way to organize this mess. </li></ul><ul><li>If we are converting from a larger unit to a smaller unit (ex. cm => mm) we multiply </li></ul><ul><ul><li>See Handout </li></ul></ul>
  8. 8. Example <ul><li>Ex.To convert 15 metres (m) to centimetres (cm) we multiply by 100 because it is two steps down the stairs. 15m x 100 = 1500cm </li></ul>
  9. 9. Example #2 <ul><li>If we are converting from a smaller unit to a larger unit (ex. M=>km) we divide (because there has to be less) </li></ul><ul><li>To convert 14 metres to kilometres (km) </li></ul>

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