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
Activity4[convert metre into Centimetre]
Do these pages activity in your textbook[page 127,128,129,130,131,
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=4l 500ml
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
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