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METRIC LINEAR
UNITS(METERS AND
KILOMETERS)
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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Metric System
Metric System – A group of units based on
measuring by tens.
Various units of metric systems.
• Kilometer (km)
• Decimeter (dm)
• Centimeter (cm)
• Meter (m)
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Metric units of length
Various units of Metric System are related
to each other.
1 meter (m) = 100 centimeter (cm)
1 decimeter (dm) = 10 centimeter (cm)
1 meter (m) = 10 decimeter (dm)
1 kilometer (km) = 1,000 meter (m)
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Tools used for measuring length

For measuring small distances in
centimeters, centimeter scale is used.

For measuring larger distances in meters,
meter stick or measuring tape is used.
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Meter or Kilometer?

Kilometer is larger unit than meter.

For measuring larger distances like length
of the road, kilometer is used.

For measuring small distances like length
of the room or door meter is used.
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A relation
Kilometer
X 10
meter
÷ 10
decimeter
centimeter
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Important Tips
To convert meter to kilometers, divide with
1,000.
Example – 50 meters = 50/1,000
= 0.050 Km
To convert kilometers to meters, multiply
with 1,000
Example – 2 Km = 2 x 1,000
= 2,000 m
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Convert 4 km to meters
Solution – 4 Km
4 x 1,000
4,000 m
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Which is longer, a measurement of 1
meter of 30 centimeters?
Answer - 1 meter
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Which unit would you use to find the
length of distance across town?
Answer – kilometer (km)
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Which metric unit would you use to find
the distance between the front of the
classroom and the back of the
classroom?
Answer – meter (m)
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How many meters are there in 3000 km?
Answer – 3000 x 1000 m
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Fill in the Blanks
6 Km = --- m
b) 200 m = ---- km
Answer –
a) 6000
b) 0.2 or 2/10
a)
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ASSESSMENT
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1.
a)
b)
c)
d)
What is the estimated height of the
door?
2
2
2
2
m
km
cm
dm
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2.
a)
b)
c)
Rock and his family are playing
croquet. Rock hits the ball 8 m.
How many centimeters did he hit
the ball?
80 cm
0.80 cm
800 cm
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3. What number makes the equation
true?
600 cm = 
m
Answer - 6
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4.
Distance between two Stations A
and B is 5 Km. How much is the
distance in meters?
Answer – 5,000 m
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5. Express 5.36 m to km.
Answer – 5.36 /1000
= 0.00536
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6. Compare using >, < or =
9 km 900 m
b) 3.2 km 
320 m
Answer –
a) >
b) =
a)
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7.
Elise covered 4 km by bus and 200
m by bus to reach his school. How
far is his school from home?
Answer – 4200 m
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8. Which is bigger unit?
a)
b)
c)
d)
meter
Centimeter
Kilometer
decimeter
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9.
Two ropes A and B have length of
2,000 m and 2 km respectively.
Which rope is longer?
Answer – Both ropes are equal
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10. What is the estimated height of the
tree?
a)
b)
c)
30 m
30 km
30 cm
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Recap






Metric system
Metric units of length
Tools used for measuring length
Meter or kiilometer?
Solved Examples
Practice problems
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Well Done!
Now Revise worksheets on the Lesson.
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