copyright@ed2netlearning,inc1 metric linear units(centimeter and decimeter) grade 3
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METRIC LINEAR UNITS(CENTIMETER
AND DECIMETER)
GRADE 3
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Hello, How are you doing?Today, we are going to start a new lesson on
Linear units.
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UnitUnit is defined as a fixed amount that is
used as a standard of measurement.
Example – Length of the pencil is 4 cm - standard unitLength of the pencil is 4 paper clips – nonstandard
unit
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LengthThe measurement of distance between two
end points.
Example – The length of the pen is 6 centimeter.
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Metric systemMetric System – A group of units based on
measuring by tens.
Various units of metric systems.• Kilometer• Decimeter• Centimeter• Meter
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Model to find the length of the object Line up to the left end of the object to the
0 mark on the ruler. Find the closer centimeter mark to the
right end of the object. Record the length.
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Find the length of the line segment
The length of the line segment is 6 cm.
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Centimeter and decimeterCentimeter (cm) and decimeter (dm) are the
units of measuring lengths.
1 decimeter (dm) = 10 centimeter (cm)
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Tips to Remember• Decimeter (dm) is bigger unit than
centimeter (cm)• For measuring small objects, centimeter
(cm) is used. Example – eraser, pencil
• For measuring bigger objects, decimeter (dm) is used. Example – book, length of magazine
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Conversion of unitsDecimeter can be changed to centimeter by
multiplying with 10.Example – 4 dm = 4 x 10 cm
= 40 cm
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The actual length of the pencil is 1dm. What is the length in cm?Answer- 1 x 10 = 10 cm
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Which is smaller in length?a) 12 dmb) 150 cmc) 190 cmd) 13 cm
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About how much distance can be covered in 1 minutes?a) 15 cmb) 15 dmc) 30 cmd) 30 dm
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Convert 164 cm to dm.Answer – 16.4 dm
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Estimate the length of wrist watch.a) 15 cmb) 15 dmc) 5 cmd) 5 dm
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ASSESSMENT
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1. Which is about 5 cm long?a) Pencilb) Bookc) Doord) wall
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2. Which is true about the ray shown in the scale?a) 5 cm longb) 5/10 dm longc) ½ dm longd) All the above
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3. Choose the best estimate.Your thumb is about --- long.a) 5 cmb) 5 dmc) 5 m
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4. Estimate the length of your finger nail.a) 1 cmb) 2 dmc) 1 dmd) 10 cm
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5. Which unit will you use to find the length of the door?
a) cmb) dmc) Either a or bd) None of the above
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6. Which unit can be best used to describe the length of your arm?a) cmb) dmc) None of the above
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7. Fill in the Blanks.a) 12 dm = --- cmb) 89 dm = --- cmAnswer – a) 120b) 890
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8. Express the following in cm.a) 11 dmb) 55 dm
a) 110 cmb) 550 cm
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9. Compare using <, > or =a) 32 dm 320 cm
b) 70 dm 70 cm
Answer-
a) =
b) >
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10. Which tool can be best used to find the length of the book?
a) Meter scaleb) Centimeter scalec) Measuring tape
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Recap• Unit• Length• Metric system• Model to find length of the object• Centimeter and Decimeter• Conversion of units• Solved Examples• Practice Problems
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Well Done!Now Practice worksheets on the lesson.