Bài 7: The measuring scale

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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.

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.

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.

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

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