Upload
david-cannon
View
226
Download
2
Tags:
Embed Size (px)
Citation preview
Measurement and EstimationLength / Distance
MCOM 520
Ryan Connors
History of Measurement
• What is measurement?
The English System of Measurement – Length/Distance
• How do we measure length and distance in the English System?
– Inch, Foot, Yard, Mile
• There are 3 feet in a yard, and 5,280 feet in a mile. How many yards are in a mile?
– The answer is 5,280/3 = 1,760 yards
• If a football field is 100 yards and there are 1,760 yards in a mile, how many football fields are in a mile?
– The answer is 1,760/100 = 17.6 football fields
The Metric System of Measurement – Length/Distance
• Who uses this form of measurement?
• What are some examples of units of distance in the Metric System?
• Units of measure in the Metric System are based on one unit of measure
– Length is based on the meter• The meter is around 3 feet
Metric System - Length• Millimeter – “milli” means Thousandth
– So a millimeter is actually 1 meter/1000.
• Centimeter – “centi” means Hundredth – So, a centimeter is actually 1 meter/100.
• Decimeter – “deci” means Tenth – So, a decimeter is actually 1 meter/10
• Decameter – “deca” means Ten – So a decameter is actually 1 meter X 10
• Hectometer – “hecto” means One Hundred – So, a hectometer is actually 1 meter X 100
• Kilometer - “kilo” means One Thousand– So a kilometer is actually 1 meter X 1000
http://school.discoveryeducation.com/clipart/clip/thinkingcapwhoa_color.html
Metric System - Length• How many millimeters are in a kilometer?
– There are 1,000 millimeters in a meter, and a kilometer is 1,000 meters. So, the answer is 1000 X 1000 = 1,000,000 millimeters
• How many centimeters are in a kilometer?
– There are 100 centimeters in a meter, and a kilometer is 1,000 meters. So the answer is 100 X 1000 = 100,000 centimeters
Metric Measurement• How wide is the tennis ball in
centimeters?
• The answer – the left side of the ball appears to start at 50 centimeters. The right side of the ball seems to end at 57 centimeters. 57-50 = 7 centimeters!
• Bonus question: Can you figure out how many tennis balls would equal a meter?
http://www.phys.selu.edu/rhett/plab194/tennis-1.jpg
Estimation
• What is estimation?– Educated guess – Webster’s dictionary describes an
educated guess as “a guess based on knowledge and experience, making it more likely to be correct”
Keyboard Estimation Exercise
• Take out your paper rulers!
– Which side is centimeters?
– Which side is inches?
Keyboard Estimation Exercise
• Measure the first three keys on the top left hand corner of the main section of keys on your keyboards. (~, 1, 2) in centimeters and inches.
• Enter the values into the corresponding columns on your worksheets
Keyboard Estimation Exercise
• Can you estimate the length of your keyboards?
– Enter the estimated total length of your keyboards in the corresponding columns on your worksheets
Summary
• The English system of length measurement uses the inch, foot, yard and mile.
• The Metric system of length is based on the meter. It uses the millimeter, centimeter, decimeter, decameter, hectometer, and the kilometer.
• We can use estimation to gain knowledge about the size of objects when we have limited resources to measure
• Please complete the worksheet for the remainder of the class!
Citations• Scientific Method and Measurement. United Learning
(1993). Retrieved March 4, 2008, from unitedstreaming:
http://streaming.discoveryeducation.com • Discovering Math: Measurement (Grades 3-5). Discovery Channel School
(2005). Retrieved March 4, 2008, from unitedstreaming:
http://streaming.discoveryeducation.com/ • Worm on ruler image: http://school.discoveryeducation.com/clipart/clip/inchworm.html