Chapter 8

In Grade 3, we learnt about measuring weight and capacity. Do you remember the 1 kilogram salt packet and 1 litre bottle? Let us learn some more about measuring weight and capacity. 1. Look at the pictures given and write the names of the animals from heaviest to lightest.
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2. Write the name of the heaviest object in your home. How did you know?
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3. Do you carry your school bag with ease or with some effort?
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4. Write the name of the heaviest book in your bag. How did you know?
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5. What is your weight? How did you know?
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Fun at Vegetable Market!

Rita and Shabnam went to the market to buy some fruits and vegetables. They saw the vegetable seller weighing vegetables. What do you think will be the weight of the half pumpkin? ________

Let Us Do

Fruits and vegetables	Estimation		Actual weight
	Less than 1 kg	More than 1 kg	Less than 1 kg	More than 1 kg
6 Bananas
5 Potatoes
10 Tomatoes
15 Onions

Let Us Explore

a. Look at the picture. You may also try doing the same.

Sugar	Poha	Daal

b. Look at the picture. You may also try doing the same.

Sugar	Peanuts	Tea leaves	Jeera

c. Look at the picture. You may also try doing the same.

Tea leaves	Kishmish	Almonds	Garam Masala

Let Us Find

1. How many 250 g daal packets will balance one 500 g daal packet?

Draw as many packets of 250 g on the empty pan such that it balances the 500 g packet shown on the left pan of the balance.

What did you find?

250 g = __________ of 500 g ( 1/2 , 2 ) 2. Draw arrows to indicate which side the pan balance will tilt? One is shown for you. 3. Match the unit convenient for measuring each of the following objects?

Let Us Do

1. How many erasers will weigh the same as a 50 g Haldi packet?______

2. A 100 g soap bar will weigh the same as ____ erasers.

3. ______erasers will weigh the same as 250 g sugar.

Let Us Think

Boxes of Sweet

Mr Shrinathan, a sweet shop owner has several orders for 1 kg Kaju-katli but he has to pack them in different sized boxes. Write down the number of boxes needed to pack 1 kg Kaju-katli in the blank space:

1. Mr Das wants the sweets in boxes weighing 500 g each. _______

2. Mrs Fernandes wants the sweets in boxes weighing 250 g each. ______

3. Mrs Khan wants the sweets in boxes weighing 100 g each. _____

4. Mr Patel wants the sweets in boxes weighing 50 g each. ______

Weighing Machines

Do you know the different types of weighing machines used to weigh different objects?

Let Us Do

Ask your parents and find the amount of consumption of the following items at your home in a month.

Items	Weight
Atta
Rice
Pulses
Sugar

Taran and his sister are lifting packets of flour, rice, and salt. What do you think they are experiencing while lifting these packets?

Have you ever lifted such packets at your home? What do you experience? Discuss.

Let Us Do

1. Try to lift some objects around you and write the names of three objects that you can lift easily. Estimate and write their weights.
1. _______     2. ______     3. ______

2. Now write the names of things that you can lift with a lot of effort. Estimate and write their weights.
1. _______     2. ______     3. ______

3. How many 1 kg packets are in

a. 10 kg : _______    c. 50 kg : _______
b. 20 kg : _______    d. 25 kg : _______

4. Match the objects in the left column with their estimated weights in the right column.

A cat	1 g to 5 g
An elephant	150 kg to 300 kg
A 1 litre filled bottle	3 kg to 5 kg
A tiger	10 g to 15 g
An empty gas cylinder	6 kg to 10 kg
A pen	More than 1000 kg
A leaf	15 kg
A wooden chair	800 g to 1000 g

Measuring Capacity

Do you remember the 1 litre bottle? How much water does your water bottle hold?

Find bottles and containers that can hold the following quantities of water. Write their names in the appropriate columns in the table given below.

Less than 1 litre	1 litre	More than 1 litre

Take help from your teachers and parents to collect different bottles with different capacities—500 ml, 250 ml, 100 ml, 50 ml, and 10 ml.


Try to fill a one litre bottle with the water contained in different smaller bottles.

Let Us Find

a) How many 500 ml bottles will fill a 1 l bottle? 500 ml + 500 ml = 1 l
1000 ml = 1 l
500 ml = 1/2 l

b) How many 250 ml bottles will fill a 1 l bottle? 250 ml + 250 ml + 250 ml + 250 ml = 1 l
1000 ml = 1 l
250 ml = 1/4 l

c) How many 100 ml bottles will fill a 1 l bottle?

d) How many

250 ml in 1/2 l = ________
250 ml in 750 ml = ________
100 ml in 1/2 l = ________
100 ml in 800 ml = ________

Let Us Do

1. Find a dosing cup or a bottle of 10 ml and try to find how many 10 ml will fill a 100 ml bottle _____

Find how many

a) 10 ml dosing cups will fill a 250 ml glass? ______

b) 10 ml dosing cups will fill a 500 ml vessel? ______

c) 10 ml dosing cups will fill a 1 l bottle? ______

2. Take a 1 ml dropper and find out

a) How many 1 ml droppers will fill a 10 ml dosing cup? _____

b) How many droppers will fill a teaspoon? _____

3. Find out how much of these liquids are used at a time.

a) Eye drops	Less than 1 ml at a time.
b) Honey	___________
c) Cough Syrup	___________
d) Cooking Oil	___________
e) _________	___________

4. Mr Krishna packages perfumed oils in different sized bottles. During a festival, the following customers asked for 1 l perfumed oils but in different sized bottles. Write the number of bottles each of them will get.

a) Ms Shetty wants bottles of 500 ml each _______
b) Mr Muthukumar wants bottles of 200 ml each _______
c) Ms Naini wants bottles of 100 ml each _______
d) Ms Kannan wants bottles of 50 ml each _______

5. Estimate and verify by measuring. Use the bottles you have collected for this purpose (for example, 500 ml, 250 ml, 100 ml, 50 ml, and 10 ml).

Container	Estimate	Actual capacity
Water bottle
Glass
Mug
Jug
Bucket
Teaspoon
Bowl

Let Us Explore

Visit nearby shops and make a list of different items that are sold in the following quantities.

50 ml	100 ml	200 ml	250 ml	500 ml	900 ml

Let Us Find

a) How many litres of water do you drink in a day? How did you find out?
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b) How much water can a crow drink at a time?
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c) How much milk do you drink in one day?
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d) How much water does an elephant drink in a day?
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What do you use the most water for? What do you use the least water for? Compare this with a few others in your grade . In which activities is your water usage the same?

How much water may be used in the following activities?



a. Water for taking a shower
b. Watering crops in a field
c. Watering flowering plants
d. Washing clothes
e. ________________
f. ________________

Containers Used for Measuring Capacity

Have you seen these measuring cans for measuring milk?

Water Conservation in Everyday Life

Have you ever noticed a small drip of water flowing from your tap or water purifier? Have you considered how much water is actually being wasted?



Take a container and put it under the leaking tap or water purifier for an hour. How much water is lost in an hour from just a slow drip? Did it surprise you?

How much water is lost in a day?

How much do you think is lost in a week?

How would this wastage of water affect us?