std 3 Maths SCERT [Lesson 8 Measure and Tell]

 Lesson 8

Measure and Tell


Length


*Length of objects or distances are measured using different units of length.


*Non-standard units

of length are Span, Foot and Cubit [length of body parts]  Non-standard units of length differ from person to person or from object to object.


*Standard units of length are Centimetre, metre and kilometre.Standard units of length do not change.

*We measure the length of pencil, book etc are measure in centimetre.

Length of table, bench etc are measure in metre.

Very long distance such as distance between two towns

are measure in Kilometre.


Metre Scale

An instrument name for measuring length metre Scale. Metre Scale is long wooden metalic rod of fixed length. It is devided into 100 equal parts. Each part is called Centimetre.


Ruler/Scale


tape






Relation between metre ,Centimetre and kilometre.

*we use 

cm for centimetre

m for metre

km  for kilometre

100cm = 1 metre

50cm = 1/2 metre


1000 m = 1 kilometre

Activity 1

*Draw a line 9cm
*Drawa line  11cm


Activity 2[classify the things their length] 


Activity3[Convert
Cm into metre.]










Activity4[convert metre into Centimetre]


Do these pages activity in your textbook[page 127,128,129,130,131,
132, 133]


/































1.1st purchased length

             of curtain=16m50cm


2nd purchased length

             of curtain=3m75cm


Total length=16m 50cm+

                            3m75cm

                         -------------------

                             20m25cm



2 . Length of blue

                 ribbon = 12m60cm


Length of white

                 ribbon = 8m40cm


Total length=12m60cm+

                             8m40cm

                      ------------------------

                         21m00cm=21m


price of 1 metre = 12RS


:. Total Price of 21m=21X12

                           21X

                           12

                        --------

                           42+

                         21

                     -----------

                       252RS




                  

1.Length of rope= 16m25cm


Length of cutting

                    piece = 5m75cm


Length of remaining

                   piece = 16m25cm +

                                    5m75cm

                                   10m 50cm



2.Length of a saree = 6 1/2 m


6m=600cm

1/2 m=50cm

6 1/2 m = 650cm

length of cutout for

                  a blouse=80cm


:.remaining length or saree

                  650-80 =570  

570cm = 5m70cm


3.Length of iron rod=8m

Length of one piece = 50cm

                 50cm = 1/2 m

From 1m rod we can

2 pieces

From 2m rod we can

 4 pieces

From 4m rod we can

8 pieces

From 8m rod we can

16 pieces


4. In one lap 200m

    In two lap 400m

    In three lap 600m

   In four  lap 800m

No. of laps=4






 









Capacity[volume]


*Quantity or amount of liquid [water, milk, oil] in a vessel or container is called volume.


*Standard units of measuring volume: Litre and millilitre. Litre is the standard unit of capacity. It is denoted "l".   Millilitre is a small unit of capacity. It is denoted be "ml".

*1 litre =1000 millilitre

             or

       1 l = 1000ml


*Half litre = 500 millilitre

                      or

           1/2 l = 500ml

       












     1.400ml +500ml =900ml


2.boy sold milk=1l

girl sold milk=500ml +

                            500ml

                            500ml

                       ---------------

                         1500ml = 1 1/2 l

milk sold in both houses are not same


3. Capacity of Vinu's

     water bottle=550ml

Capacity of Shan's

water bottle=550+250=800ml

Total Capacity of two water

bottles = 550+800=1350ml

1350ml = 1l 350ml
















































1.Quantity of milk for 

           tea=4500ml

Quantity of milk for

       payasam=15 l 500ml


Total Quantity 

            of milk=4 l500ml    +

                          15 l500ml

                       -----------------

                           20 l  00ml


             20 litre

 Price of one litre

                     milk=36RS

Price of 20 litre

                        milk=36X20

         720 Rs


2.Quantity of milk milked in the   morning=8Litre

Quantity of milk milked in the evening = 5 Litre

Total quantity of

                 milk=8+5=13 Litre

wage for milking

one Litre = 6RS

wage for milking

13 Litre = 13X6=78RS

Quantity of milk sold

in the morning=6 l 700ml

Quantity of milk sold 

in the evening = 3 l 800ml

Total Quantity of milk sold in one day=6I700ml +

                      3I800ml

                   -----------------

                    10I500ml

1.Kerosene contained

     in a can=4l500ml

Kerosene used to fill 

in the stove=2l  150ml

kerosene left in

the can=4l 500ml-2 l 150ml

           2I 350ml


2.Total quantity of

          paint=13I 500ml

Quantity of paint

used in 1st day=6l

Quantity of paint

used in 2nd day=5l 500ml

Total Quantity of paintused in two days = 6l+5I500ml

              11I500ml


Honey P-141


All bottles are equal. First he filled to bottles of 50ml.so he also filled 10 bottles of 100ml and 200ml


50X10=500ml

100X10=1000ml

200X10=2000ml


3500ml = 3l 500ml


Do this page👇















       






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