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Why the Metric system?

Why the Metric system?. Used in the majority of the world. IT’S EASIER TO USE than the English System. Based on the number 10!. Metric Prefixes. Prefixes are added to the names of basic SI units such as meter (also liter and gram). Prefixes describe very small or large measurements.

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Why the Metric system?

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  1. Why the Metric system? • Used in the majority of the world. • IT’S EASIER TO USE than the English System. • Based on the number 10!

  2. Metric Prefixes • Prefixes are added to the names of basic SI units such as meter (also liter and gram). • Prefixes describe very small or large measurements.

  3. Converting Units • To convert 1,565 pennies to the dollar amount, you divide 1,565 by 100 (since there are 100 pennies in a dollar). • Converting SI units is just as easy as converting pennies to dollars.

  4. Metric Prefixes and Converting Units To convert between units: • Start with the given prefix • Slide the decimal point to the left or right until you reach the new prefix.

  5. Solving Problems • Convert 655 mm to m • Looking for: • …the distance in meters • Given: • …distance = 655 millimeters • Relationships: • Ex. There are 1000 millimeters in 1 meter • Solution: 655 mm = .655 meters

  6. Solving Problems Convert 142 km to m… • Looking for: • …the distance in meters • Given: • …distance = 142 kilometers • Relationships: • Ex. There are ? meters in 1 kilometer? • Solution: Think about answer…1,000 m in 1 km …OR 1,000 X 142 = 142,000 m …So answer is 1,000 times bigger …OR move decimal 3 places to right (make bigger) 142. . . . 0 0 0 = 142, 000

  7. Solving Problems Convert 754,000 cm to km… • Looking for: • …the distance in kilometers • Given: • …distance = 754,000 centimeters • Relationships: • Ex. There are ? cm in 1 m? • There are ? m in 1 km? • Solution: …100 cm in 1 m So…754,000cm/100 cm= 7,540 m …1000 m in 1 km So…7,540m/1000 m= 7.540 km

  8. Converting Units • A conversion factor is a ratio that has the value of one. • This method of converting units is called dimensional analysisorfactor label method. • To do the conversion you multiply 4.5 feet by a conversion factor.

  9. Solving Problems Convert 4.5 ft to cm • Looking for: • You are asked for the distance in cm • Given: • You are given the distance in ft. • Relationships: • Ex. There are ? cm in 1 ft? 30.48 cm = 1 ft • Solution: • Make a conversion factor from equivalent

  10. Converting Units • Use the correct conversion factor to convert: • 175 yds. to m. • 2.50 in. to mm.

  11. 1. WS: “Metric Conversion 1” 2. WS #3.1: “Dimensional Analysis”

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