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Class 4 Maths Chapter 8 Weigh it, Pour it Question Answer Solutions
The Cleanest Village Class 4 Maths Solutions
Class 4 Maths Chapter 8 Solutions
NCERT Textbook Page 115
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.
Question 1.
Look at the pictures given and write the names of the animals from heaviest to lightest.
Solution:
Elephant > Giraffe > Dog > Squirrel > Ant
Question 2.
Write the name of the heaviest object in your home. How did you know?
Solution:
Do it yourself.
Question 3.
Do you carry your school bag with ease or with some effort?
Solution:
Do it yourself.
Question 4.
Write the name of the heaviest book in your bag. How did you know?
Solution:
Do it yourself.
Question 5.
What is your weight? How did you know?
Solution:
Do it yourself.
NCERT Textbook Page 115
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 half pumpkin?
Solution:
The weight of a full pumpkin = 1 kg
So, the weight of half cut pumpkin = \(\frac{1}{2}\) of full pumpkin = \(\frac{1}{2}\) kg
NCERT Textbook Page 116 – Let Us Do
Estimate the weight of the following and put a tick mark (✓) in the appropriate cell. Try to verify if your guess is correct by using a weighing balance.
Solution:
Do it yourself.
NCERT Textbook Pages 116-117 – Let Us Explore
a. Look at the picture. You may also try doing the same
Solution:
Do it yourself.
b. Look at the picture. You may also try doing the same.
Solution:
Do it yourself.
c. Look at the picture. You may also try doing the same.
Solution:
Do it yourself.
NCERT Textbook Pages 117-118 – Let Us Find
Question 1.
How many 250 g daal packets will balance one 500 g daal packet?
Solution:
Since 250 g + 250 g = 500 g
Therefore, 2 packets of 250 g 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 (________, 2)
Solution:
250 g = \(\frac{1}{2}\) of 500 g (\(\frac{1}{2}\), 2)
Question 2.
Draw arrows to indicate which side the pan balance will tilt? One is shown for you.
Solution:
Question 3.
Match the unit convenient for measuring each of the following objects.
Solution:
NCERT Textbook Page 119 – Let Us Do
Question 1.
How many erasers will weigh the same as a 50 g Haldi packet?
Solution:
10 g = 1 eraser
⇒ 50g = 5 × 10g = 5 × 1 eraser
= 5 erasers
So, 5 erasers will weigh equal to a 50 g Haldi packet.
Question 2.
A 100 g soap bar will weigh the same as ________ erasers.
Solution:
10 g = 1 eraser
⇒ 100 g = 10 × 10 g = 10 × 1 eraser = 10 erasers
So, 100 g soap bar will weigh the same as 10 erasers.
Question 3.
________ erasers will weigh the same as 250 g sugar.
Solution:
10 g =1 eraser
⇒ 250 g = 25 × 10 g = 25 × 1 eraser = 25 erasers
So, 25 erasers will weigh the same as 250 g of sugar.
NCERT Textbook Page 119 – 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:
Question 1.
Mr Das wants the sweets in boxes weighing 500 g each.
Solution:
Since 1 kg = 1000 g
= 500 g + 500 g = 2 × 500 g
So, Mr Shrinathan needs 2 boxes of500 g each to pack 1 kg Kaju-Katli.
Question 2.
Mrs Fernandes wants the sweets in boxes weighing 250 g each.
Solution:
Since 1 kg = 1000 g
= 250 g + 250 g + 250 g + 250 g = 4 × 250 g
So, Mr Shrinathan needs 4 boxes of250 g each to pack 1 kg Kaju-Katli.
Question 3.
Mrs Khan wants the sweets in boxes weighing 100 g each.
Solution:
Since 1 kg = 1000 g
= 100 g + 100 g + 100 g + 100 g + 100 g + 100 g + 100 g + 100 g + 100 g + 100 g
= 10 × 100 g
So, Mr Shrinathan needs 10 boxes of 100 g each to pack 1 kg Kaju-Katli.
Question 4.
Mr Patel wants the sweets in boxes weighing 50 g each.
Solution:
Since 1 kg = 1000 g
= 10 × 100 g
= 10 × (2 × 50 g)
= 20 × 50 g
So, Mr Shrinathan needs 20 boxes of 50 g each to pack 1 kg Kaju-Katli.
NCERT Textbook Page 120 – Weighing Machines
Do you know the different types of weighing machines used to weigh different objects?
Solution:
Do it yourself.
NCERT Textbook Page 120 – Let Us Do
Ask your parents and find the amount of consumption of the following items at your home in a month.
Solution:
Do it yourself.
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.
Solution:
The wheat flour packet weighs 10 kg, and the rice packet weighs 5 kg, which are difficult to lift for a long period.
NCERT Textbook Page 121 – Let Us Do
Question 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. ________
Solution:
Do it yourself.
Question 2.
Now write the name of things that you can lift with a lot of effort. Estimate and write their weights.
1. ________
2. ________
3. ________
Solution:
Do it yourself.
Question 3.
How many 1 kg packets are in
(a) 10 kg
(b) 20 kg
(c) 50 kg
(d) 25 kg
Solution:
(a) 10 kg = 10 × 1 kg
There are 10 packets of 1 kg each in 10 kg.
(b) 20 kg = 20 × 1 kg
There are 20 packets of 1 kg each in 20 kg.
(c) 50 kg = 50 × 1 kg
There are 50 packets of 1 kg each in 50 kg.
(d) 25 kg = 25 × 1 kg
There are 25 packets of 1 kg each in 25 kg.
Question 4.
Match the objects in the left column with their estimated weights in the right column.
Solution:
NCERT Textbook Page 122 – 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.
Solution:
Do it yourself.
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 one litre bottle with the water contained in different smaller bottles.
Solution:
Do it yourself.
NCERT Textbook Pages 123-124 Let Us Find
(a) How many 500 ml bottles will fill a 11 bottle?
Solution:
Since 11 = 1000 ml = 500 ml + 500 ml
= 2 × 500 ml
Thus, two 500 ml bottles will fill a 1 l bottle.
(b) How many 250 ml bottles will fill 11 bottle?
Solution:
Since 1 l = 1000 ml
= 250 ml + 250 ml + 250 ml + 250 ml
= 4 × 250 ml
Thus, four 250 ml bottles will fill a 1 litre bottle,
(c) How many 100 ml bottles will fill a 1 l bottle?
Solution:
Since 11= 1000 ml
= 100 ml + 100 mlm + 100 ml + 100 ml + 100 ml + 100 ml + 100 ml + 100 ml + 100 ml + 100 ml
= 10 × 100 ml
Thus, ten 100 ml bottles will fill a 1 l bottle.
(d) How many 100 ml
250 ml in \(\frac{1}{2}\) l = ________
250 ml in 750 ml = ________
100 ml in \(\frac{1}{2}\) l = ________.
100 ml in 800 ml = ________
Solution:
\(\frac{1}{2}\)l = \(\frac{1}{2}\) × 1000 ml = 500 ml
= 250 ml + 250 ml
= 2 × 250 ml
So, there are two 250 ml in \(\frac{1}{2}\) l.
750 ml = 250 ml + 250 ml + 250 ml
= 3 × 250 ml
So, there are three 250 ml in 750 ml.
\(\frac{1}{2}\) l = \(\frac{1}{2}\) × 1000 ml = 500 ml
= 100 ml + 100 ml + 100 ml + 100 ml + 100 ml
= 5 × 100 ml
So, there are five 100 ml in \(\frac{1}{2}\) l.
800 ml = 100 ml + 100 ml + 100 ml + 100 ml + 100 ml + 100 ml + 100 ml + 100 ml
= 8 × 100 ml
So, there are eight 100 ml in 800 ml.
NCERT Textbook Pages 124-125 – Let Us Do
Question 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.
Solution:
100 ml = 10 × 10 ml
So, ten 10 ml cups 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?
Solution:
(a) 250 ml = 25 × 10 ml
So, 25 dosing cups of 10 ml will fill a 250 ml glass.
(b) 500 ml = 50 × 10 ml
So, 50 dosing cups of 10 ml will fill a 500 ml vessel.
(c) 1 l = 1000 ml = 100 × 10 ml
So, 100 dosing cups of 10 ml will fill a 1 l bottle.
Question 2.
Take a 1ml dropper and find out
(а) How many 1 ml droppers will fill a 10 ml dosing cup?
Solution:
10 ml – 10 × 1 ml
So, ten droppers of 1 ml each will fill a 10 ml dosing cup.
(b) How many droppers will fill a teaspoon?
Solution:
Do it yourself.
Question 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) Syrup _______________________
(d) Cooking Oil _______________________
(e) ________ _______________________
Solution:
Do it yourself.
Question 4.
Mr Krishna packages perfumed oil 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
Solution:
(a) 1 l – 1000 ml = 500 ml + 500 ml
So Mr Krishna needs two 500 ml sized bottles.
(b) 1 l = 1000 ml = 200 ml + 200 ml + 200 ml + 200 ml + 200 ml
So, Mr Krishna needs five 200 ml sized bottles.
(c) 1 l = 1000 ml = 10 × 100 ml
So, Mr Krishna needs ten 100 ml sized bottles.
(d) 1 l = 1000 ml = 20 × 50 ml
So, Mr Krishna needs twenty 50 ml sized bottles.
Question 5.
Estimate and verify by measuring. Use the bottles you have collected for this purpose (for example, 500 ml, 250 ml, 100 ml, 50 nil and 10 ml).
Solution:
Do it yourself.
NCERT Textbook Pages 125-126 – Let Us Explore
Visit nearby shops and make a list of different items that are sold in the following quantities.
Solution:
Do it yourself.
NCERT Textbook Page 126 – Let Us Find
(a) How many litres of water do you drink in a day? How did you find out?
Solution:
Do it yourself.
(b) How much water can a crow drink at a time?
Solution:
Do it yourself.
(c) How much milk do you drink in one day?
Solution:
Do it yourself.
(d) How much water does an elephant drink in a day?
Solution:
Do it yourself.
NCERT Textbook Pages 126-127
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?
Solution:
Do it yourself
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) _______________________
Solution:
Do it yourself.
NCERT Textbook Page 127
Water Conservation in Everydav 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?
Solution:
Do it yourself.