Welcome Get your calculator and binder'

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Welcome! Get your calculator and binder.

• Todays Brainteaser
• Mrs. Wittmer needed to put up a baby-gate to
  prevent her daughter from crawling out to the
  kitchen. However, she couldnt find anything to
  measure the width of the doorway. What did she
  do to estimate the width of the doorway?

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Note 2.1 Units of Measure

• Our goals are to
• Choose appropriate units of measure
• Estimate measures
• We need to learn this for use in the following
  situations
• Cooking, Traveling, Careers in medicine,
  engineering, architecture, landscaping,
  surveying, cartography, jewelry-making, sports
  (just to name a few)!

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Visual Diagrams for Measurements
Using parts of the body to estimate measurements

• 1 millimeter thickness of fingernail
• 1 centimeter width of pinkie fingernail
• 1 decimeter width of your hand
• 1 meter from your nose to your fingertips of
  outstretched hand

• We need to know how to measure
• Distance
• yards, feet, inches, miles
• meters
• Mass (Weight)
• pounds, ounces, grams
• Capacity (volume)
• cups, liters

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Conversion table for metric units

• K H D (unit) D C M
• K H D (unit) D C M
• i e e e e i
• l c k c n l
• o t a i t l
• o i i

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Precise Measurements

• A measurement that is nearly exact is said to be
  accurate.
• A measure is more precise when you use a smaller
  unit of measure

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Did you know?

• Most European countries use Celsius to tell the
  temperature.
• 80 F is equal to 26.666666666666668 C
• Practically every other country measures speed in
  kilometers per hour instead of miles per hour.
• 45 mph is equal to 72.42048 kmh

• We are practically the ONLY country that insists
  on not using the METRIC system?
• In Britain, you tell your weight in STONES.
• 1 Stone 14 pounds
• A person who weighs 132 pounds would weigh 9.6
  stones.

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Example 1 Circle the unit of measure that gives
a more precise measurement.

• Meter or Centimeter
• Pint or Quart
• Milliliter or Liter
• Inch or Yard
• Gram or Kilogram
• Pint or Gallon
• Kilometer or Mile
• Meter or Yard

• "Precisely so, my dear Watson!"

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Work on Assignment 2.1

• Page 54 12-33 all

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Example 2 Circle the appropriate unit to
estimate the measurement

• Width of this textbook inch, foot, or yard
• Fruit juice in a bottle milliliter, liter, or
  kiloliter
• Diameter of a pearl meter, centimeter,
  millimeter
• Mass of a parakeet ounce, pound, or ton
• Flour in a bread recipe cup, teaspoon, or liter
• Diameter of a quarter meter, decimeter, or
  millimeter

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Example 3 Circle the best estimate for each
measure.

• Length of a classroom 30 cm, 30 ft, or 30 yd
• Diameter of a basketball 24 ft, 24 mm, or 24 cm
• Length of a newborn baby 47.5 cm, 47.5 mm, or
  47.5 ft
• Juice in a can 355 oz, 355 pt, or 355 mL