MEASURING LENGTH (teach)

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Measuring length using the metric system.

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MEASURING LENGTH (teach)

  1. 1. MeasuringLength and Distance<br />By Moira Whitehouse PhD<br />
  2. 2. It is said that long, long ago, people used the length of the king’s foot to settle arguments about how long or wide something was. <br />So that everyone would know how long his foot was, the king passed out sticks the same length as his foot. The sticks were called the ruler’s foot or “rulers.”<br />
  3. 3. •Then, about 200 years ago, someone decided that measurement systems would be better based on Mother Earth than on some king’s foot. <br />•So, using mathematics, they figured the distance from the equator to the north pole.<br />Here<br />10 Million<br />Here<br />•And divided that distance by:<br />
  4. 4. And the answer to that division problem was named:<br />The Meter<br />The system is called the <br />System International or the Metric System.<br />•A whole system of measurement was developed with the meter as its basis.<br />
  5. 5. •The Metric System is based on dividing the meter by the number 10 or multiplying it by some multiple of 10.<br />•Considering the various numbers we used in the English system (12 inches to a foot, 3 feet to a yard, 1760 yards to a mile , etc. etc.) multiplying or dividing by 10 makes the Metric System seem easy. <br />
  6. 6. Some of the tools used to measure length and distance are a metric ruler, a meter stick and a metric tape measure.<br />
  7. 7. •The units usually used to measure length and distance are the millimeter (10-3), the centimeter (10-2), the meter, and the kilometer (10 3). <br />• By convention, the units decimeter (10-1), decameter (101) and hectometer (102 ) are seldom used. <br />•Meters or kilometers are used to measure longer distances or longer things such as school buses. <br />http://www.flickr.com Wagner T. Cassimiro "Aranha"'<br />
  8. 8. •For measuring longer distances, meter sticks can be placed one after another along the distance, counting the total number. <br />•Smaller divisions of the meter (millimeters and centimeters) are used to measure the length of shorter distances or things (like pieces of chalk or height of a school desk).<br />
  9. 9. •Here we have drawing of a decimeter; it takes 10 of these to make up a meter.<br />•Here is a drawing of one of the 10 centimeters found in a decimeter.<br />•An accurate drawing of one of<br />the 10 millimeters found in a <br />centimeter would be only<br />as long as a dime is thick.<br />
  10. 10. This drawing shows 1/10th of a meter stick, a decimeter (dm). It has 10 centimeters (cm) and each of those centimeters has 10 millimeters (mm) that are just about the thickness of a dime.<br />The arrows indicate specific mm locations.<br />
  11. 11. Before getting some practice in measuring length, it is important to understand that scientists use the meter as the basis for measuring mass and volume as well as length.<br />
  12. 12. • Length/Distance: how far from here to there in<br /> •Kilometers (thousands of meters....Fort Worth to Dallas, 50 Km)<br /> •Meters (a school bus, about 10 meters)<br /> •Centimeters (top of your desk, about 70 Cm) <br /> •Millimeters (width of a dime, 1 mm)<br />
  13. 13. Volume: Scientist also use the meter (cubic meters) to measure volume (how much space something takes up.)<br />
  14. 14. Mass: And in a round about way, scientists even use the meter to measure mass.<br /> •That is because the amount of water that fits into 1 centimeter cubed has a mass of 1 gram and the gram is the unit we use to measure mass.<br />
  15. 15. We will start by measuring distance, first by finding the correct millimeter and then stating the answer in centimeters for “A” through “G”. <br />Stated as centimeters<br />
  16. 16. We will start by measuring distance, first by finding the correct millimeter and stating the answer in centimeters for “A” through “G”. First, “A”.<br />Stated as centimeters<br />
  17. 17. We will start by measuring distance, first by finding the correct millimeter and then stating the answer in centimeters for “A” through “G”. First, “A”.<br />18 mm<br />1.8 cm<br />Stated as centimeters<br />
  18. 18. We will start by measuring distance, first by finding the correct millimeter and then stating the answer in centimeters for “A” through “G”. Then, “B”.<br />18 mm<br />1.8 cm<br />Stated as centimeters<br />
  19. 19. We will start by measuring distance, first by finding the correct millimeter and then stating the answer in centimeters for “A” through “G”. Then, “B”.<br />18 mm<br />1.8 cm<br />32 mm<br />3.2 cm <br />Stated as centimeters<br />
  20. 20. We will start by measuring distance, first by finding the correct millimeter and then stating the answer in centimeters for “A” through “G”. Then, “C”.<br />18 mm<br />1.8 cm<br />32 mm<br />3.2 cm<br />Stated as centimeters<br />
  21. 21. We will start by measuring distance, first by finding the correct millimeter and then stating the answer in centimeters for “A” through “G”. Then, “C”.<br />18 mm<br />1.8 cm<br />32 mm<br />3.2 cm<br />44 mm<br />4.4 cm<br />Stated as centimeters<br />
  22. 22. We will start by measuring distance, first by finding the correct millimeter and then stating the answer in centimeters for “A” through “G”. Then, “D”.<br />18 mm<br />1.8 cm<br />32 mm<br />3.2 cm<br />44 mm<br />4.4 cm<br />Stated as centimeters<br />
  23. 23. We will start by measuring distance, first by finding the correct millimeter and then stating the answer in centimeters for “A” through “G”. Then, “D”.<br />18 mm<br />1.8 cm<br />32 mm<br />3.2 cm<br />44 mm<br />4.4 cm<br />Stated as centimeters<br />59 mm<br />5.9 cm<br />
  24. 24. We will start by measuring distance, first by finding the correct millimeter and then stating the answer in centimeters for “A” through “G”. Then, “E”.<br />18 mm<br />1.8 cm<br />32 mm<br />3.2 cm<br />44 mm<br />4.4 cm<br />Stated as centimeters<br />59 mm<br />5.9 cm<br />
  25. 25. We will start by measuring distance, first by finding the correct millimeter and then stating the answer in centimeters for “A” through “G”. Then, “E”.<br />18 mm<br />1.8 cm<br />32 mm<br />3.2 cm<br />44 mm<br />4.4 cm<br />Stated as centimeters<br />59 mm<br />5.9 cm<br />7.5 cm<br />75 mm<br />
  26. 26. We will start by measuring distance, first by finding the correct millimeter and then stating the answer in centimeters for “A” through “G”. Then, “F”.<br />18 mm<br />1.8 cm<br />32 mm<br />3.2 cm<br />44 mm<br />4.4 cm<br />Stated as centimeters<br />59 mm<br />5.9 cm<br />7.5 cm<br />75 mm<br />
  27. 27. We will start by measuring distance, first by finding the correct millimeter and then then stating the answer in centimeters for “A” through “G”. Then, “F”.<br />18 mm<br />1.8 cm<br />32 mm<br />3.2 cm<br />44 mm<br />4.4 cm <br />Stated as centimeters<br />59 mm<br />5.9 cm<br />7.5 cm<br />75 mm<br />87 mm<br />8.7 cm<br />
  28. 28. We will start by measuring distance, first by finding the correct millimeter and then stating the answer in centimeters for “A” through “G”. Then, “G”.<br />18 mm<br />1.8 cm<br />32 mm<br />3.2 cm<br />44 mm<br />4.4 cm<br />Stated as centimeters<br />59 mm<br />5.9 cm<br />7.5 cm<br />75 mm<br />87 mm<br />8.7 cm<br />
  29. 29. We will start by measuring distance, first by finding the correct millimeter and then stating the answer in centimeters for “A” through “G”. Then, “G”.<br />18 mm<br />1.8 cm<br />32 mm<br />3.2 cm<br />44 mm<br />4.4 cm<br />Stated as centimeters<br />59 mm<br />5.9 cm<br />7.5 cm<br />75 mm<br />87 mm<br />8.7 cm<br />96 mm<br />9.6 cm<br />
  30. 30. How long is Mr. Toad?<br />
  31. 31. How long is this fish in millimeters?<br />How many centimeters is that?<br />The butterflies wing span is _________mm or stated in centimeters is ____________.<br />The caterpillar’s length in millimeters is _________ or stated in centimeters is ____________.<br />
  32. 32. Some rulers start at the very end of the stick and others have a small space before the actual ruler starts. <br />
  33. 33. Placement of one of these screwdrivers will get you the wrong answer for the screwdriver’s length.<br /> • Is this screwdriver 900 millimeters long (that is the same as 9 centimeters)?<br /> •Or is it 940 millimeters long (that is the same as 9 centimeters plus 4 millimeters?<br />
  34. 34. What is the length of this tooth pick?<br />In millimeters? Stated in centimeters?<br />
  35. 35. What is the length of this paper clip in millimeters? Stated in centimeters?<br />
  36. 36. •Here is a little “pop” quiz as we finish discussing the measurement of length. <br />•In pairs, measure your height with a meter stick or metric measuring tape.<br />•How tall are you are in these metric length units?<br />• meters<br /> • millimeters<br />• centimeters<br />

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