METRIC LINEAR UNITS(CENTIMETER AND DECIMETER) GRADE 3 copyright@Ed2netLearning,Inc

copyright@Ed2netLearning,Inc Hello, How are you doing? Today, we are going to start a new lesson on Linear units. copyright@Ed2netLearning,Inc

copyright@Ed2netLearning,Inc Unit Unit is defined as a fixed amount that is used as a standard of measurement. Example – Length of the pencil is 4 cm - standard unit Length of the pencil is 4 paper clips – nonstandard unit copyright@Ed2netLearning,Inc

copyright@Ed2netLearning,Inc Length The measurement of distance between two end points. Example – The length of the pen is 6 centimeter. copyright@Ed2netLearning,Inc

copyright@Ed2netLearning,Inc Metric system Metric System – A group of units based on measuring by tens. Various units of metric systems. Kilometer Decimeter Centimeter Meter copyright@Ed2netLearning,Inc

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. copyright@Ed2netLearning,Inc

Find the length of the line segment The length of the line segment is 6 cm. copyright@Ed2netLearning,Inc

Centimeter and decimeter Centimeter (cm) and decimeter (dm) are the units of measuring lengths. 1 decimeter (dm) = 10 centimeter (cm) copyright@Ed2netLearning,Inc

copyright@Ed2netLearning,Inc 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 copyright@Ed2netLearning,Inc

copyright@Ed2netLearning,Inc Conversion of units Decimeter can be changed to centimeter by multiplying with 10. Example – 4 dm = 4 x 10 cm = 40 cm copyright@Ed2netLearning,Inc

The actual length of the pencil is 1dm. What is the length in cm? Answer- 1 x 10 = 10 cm copyright@Ed2netLearning,Inc

Which is smaller in length? 12 dm 150 cm 190 cm 13 cm copyright@Ed2netLearning,Inc

About how much distance can be covered in 1 minutes? 15 cm 15 dm 30 cm 30 dm copyright@Ed2netLearning,Inc

copyright@Ed2netLearning,Inc Convert 164 cm to dm. Answer – 16.4 dm copyright@Ed2netLearning,Inc

Estimate the length of wrist watch. 15 cm 15 dm 5 cm 5 dm copyright@Ed2netLearning,Inc

copyright@Ed2netLearning,Inc ASSESSMENT copyright@Ed2netLearning,Inc

copyright@Ed2netLearning,Inc 1. Which is about 5 cm long? Pencil Book Door wall copyright@Ed2netLearning,Inc

2. Which is true about the ray shown in the scale? 5 cm long 5/10 dm long ½ dm long All the above copyright@Ed2netLearning,Inc

3. Choose the best estimate. Your thumb is about --- long. 5 cm 5 dm 5 m copyright@Ed2netLearning,Inc

4. Estimate the length of your finger nail. 1 cm 2 dm 1 dm 10 cm copyright@Ed2netLearning,Inc

5. Which unit will you use to find the length of the door? cm dm Either a or b None of the above copyright@Ed2netLearning,Inc

6. Which unit can be best used to describe the length of your arm? cm dm None of the above copyright@Ed2netLearning,Inc

copyright@Ed2netLearning,Inc 7. Fill in the Blanks. 12 dm = --- cm 89 dm = --- cm Answer – 120 890 copyright@Ed2netLearning,Inc

Express the following in cm. a) 11 dm b) 55 dm copyright@Ed2netLearning,Inc

9. Compare using <, > or = a) 32 dm  320 cm b) 70 dm  70 cm Answer- = > copyright@Ed2netLearning,Inc

10. Which tool can be best used to find the length of the book? Meter scale Centimeter scale Measuring tape copyright@Ed2netLearning,Inc

copyright@Ed2netLearning,Inc Recap Unit Length Metric system Model to find length of the object Centimeter and Decimeter Conversion of units Solved Examples Practice Problems copyright@Ed2netLearning,Inc

copyright@Ed2netLearning,Inc Well Done! Now Practice worksheets on the lesson. copyright@Ed2netLearning,Inc