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VIDEO TẠI ĐÂY
Hey stary! You are
aware that we need a standard device or instrument for measurement?
To measure length, we
need a device called measuring scale.
Look at the scale. Do
you notice some marking and number on it Stary?
Yes, of course. There
are number up to 15.
Each number shows the
distance called a centimetre.
For
example
0 to 1 is a centimetre
12 to 13 is a
centimetre
And 5 to 6 is also a
centimetre.
Stary, look closely! Do you see something else?
Right! There are
smaller marking within each centimetre.
Come, let us count the
small marking 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
Thus, each centimetre
has 10 such small divisions.
Stary, each such small
division is called a millimetre.
So, we can see that 1
centimetre has 10 millimetres.
Now if we have 2
centimetres. There will be 20 such small divisions.
So 2 centimeters will
have 20 millimetres.
In the same manner 5
centimetres will be equal to 50 millimetres and 10 centimetres will be equal to
100 millimetres.
Centimetre and
millimetre are written in short as ‘cm’ and ‘mm’.
So we can say 8cm is
equal to 80mm.
Stary! We can measure
smaller lengths using a measuring scale.
For example
The thickness of
breadth of a notebook or length of craft paper.
Hey! Why have you
brought that cloth.
Oh, Stary!,We cannot measure the length of cloth using a measuring scale.
Oh, Stary!,We cannot measure the length of cloth using a measuring scale.
We need a meter scale
for measuring longer length- the meter scale .
Look at this scale
Stary. This is a meter scale.
Observe! The last number show here is 100.
Observe! The last number show here is 100.
So there are 100 cm on
it. So 1 meter contains 100 cm.
It will write meter in
short as ‘m’.
Then 1m equal 100cm.
Then 1m equal 100cm.
What are you thinking of Stary.
Oh you want to measure greater distances.
Greater distances!
Greater distance likes
length of the room are measured using another instrument call a measuring tape.
This tape has length
more than 1 meter.
So Millimetre,
Centimetre,
Meter are standard
units for measuring length
By standard units, It is meant that anywhere you go ,these are the accepted units for measuring length
By standard units, It is meant that anywhere you go ,these are the accepted units for measuring length
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