1.
What aspects of an object are measureable?<br />
2.
Learning Target:Students will learn how to measure length accurately using customary and metric units and estimating them using benchmarks. <br />
3.
Customary Units:inches (in.)foot (ft)yard (yd)mile (mi.)How they are related to one another:1ft = 12in. 1yd = 3ft = 36in.1mi. = 1,760yd = 5,280ft<br />
4.
Metric Units:millimeter (mm)centimeter (cm)meter (m)kilometer (km)How they are related to one another:1cm = 10mm 1m = 100cm = 1,000mm1km = 1,000m<br />
5.
Common measuring tools:foot rulercentimeter ruleryardstickmetersticktape measureHow many units on are each?<br />
6.
How many units on are each? foot ruler -12 inchescentimeter ruler – 30 centimetersyardstick – 3 footmeterstick – 100 centimeterstape measure – can vary but normally has both customary and metric units<br />
7.
Choose an appropriate measuring tool for the length. Explain your reasoning.1. Diameter of a circular pool.2. Diameter of a car tire.Common measuring tools:foot ruler centimeter ruleryardstick metersticktape measure<br />
8.
Answers: 1. Diameter of a circular pool.A tape measure; the pool’s diameter is greater than one yard an greater than one meter.2. Diameter of a car tire.Yardstick or meterstick; the tire’s diameter is greater than one foot and greater than 30 centimeters and less than one yard and less than one meter.<br />
9.
Measure the length of the spoon to the nearest inch.http://www.future-edge.com/blackboard/MathM3B211/images/spoon.jpg<br />
11.
Find the length of the object to the nearest centimeter and millimeter.Nearest centimeter = 3 cmNearest millimeter = 34 mmhttp://physicspmb.ukzn.ac.za/OnlineExercises/IntroVernier/Figures/Fig3.gif<br />
12.
Find the length of the line segment to the nearest centimeter and millimeter.http://www.future-edge.com/blackboard/MathM3B211/images/screw.jpg<br />
13.
Answer:5 cm51 mm http://www.future-edge.com/blackboard/MathM3B211/images/screw.jpg<br />
14.
What benchmarks can we use to estimate the measure of an object?<br />
15.
Benchmarks for Units of LengthCustomary Units:inch – length of a small paper clipfoot – distance from elbow to knuckleyard – width of a doorMetric Units:millimeter – thickness of a dimecentimeter – width of your little fingermeter – height of a chair <br />
16.
Choose an appropriate customary and metric unit for length. Explain your reasoning.1. width of our classroom2. distance across town<br />
17.
Answer: 1. width of our classroom -feet, yards, or meters; the width is much greater than 1 in. or 1 cm and much less than 1 mi. or 1 km2. distance across town –miles or kilometers; the width is much greater than 1 yd or 1 m.<br />
18.
Can you measure length accurately using customary and metric units and estimating them using benchmarks?<br />
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