Students often refer to Maths Mela Class 4 Solutions Chapter 8 Weigh it, Pour it Question Answer NCERT Solutions to verify their answers.
Class 4 Maths Chapter 8 Weigh it, Pour it Question Answer Solutions
Weigh it, Pour it Class 4 Maths Solutions
Class 4 Maths Chapter 8 Solutions
Question 1.
Look at the pictures given and write the names of the animals from heaviest to lightest.
Answer:
The order from heaviest to lightest is elephant, giraffe, dog, squirrel.
Question 2.
Write the name of the heaviest object in your home. How did you know?
Answer:
The heaviest object at my home is refrigerator. I know this because it is very difficult to move and feels much heavier than other objects like chairs or tables.
Question 3.
Do you carry your school bag with ease or with some effort?
Answer:
I carry my school bag with some effort. It feels heavy especially when it is full of books.
Question 4.
Write the name of the heaviest book in your bag. How did you know?
Answer:
The heaviest book in my bag is the math textbook. I know this because it feels denser and heavier when I hold it compared to my notebooks.
Question 5.
What is your weight? How did you know?
Answer:
My weight is 30 kg.
I know this because I weighed myself on a weighing machine.
Fun at Vegetable Market! (Page 115)
Rita and Shabnam went to the market to buy some fruits and vegetables. They saw the vegetable seller weighing vegetables.
Question 1.
What do you think will be the weight of the half pumpkin?
Answer:
Weight of 1 pumpkin = 1 kg
∴ Weight of \(\frac{1}{2}\) pumpkin = \(\frac{1}{2}\) kg
Let Us Do (Page 116)
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.
Answer:
Let Us Find (Pages 117-118)
Question 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 (\(\frac{1}{2}\), 2)
Answer:
Dividing the total weight by the weight of each packet = \(\frac{500}{250}\) = 2 packet daal 250 g = \(\frac{1}{2}\) of 500 g
Question 2.
Draw arrows to indicate which side the pan balance will tilt? One is shown for you.
Answer:
Question 3.
Match the unit convenient for measuring each of the following objects?
Answer:
Let Us Do (Page 119)
Question 1.
How many erasers will weigh the same as a 50 g Haldi packet?
Answer:
Weigh of 1 eraser =10 g.
and weight of Haldi packet =50 g
∴ No. of erasers = \(\frac{50}{10}\) = 5
Question 2.
A 100 g soap bar will weigh the same as ______ erasers.
Answer:
No. of erasers = \(\frac{100g}{10}\) =10 g
Question 3.
______ erasers will weigh the same as 250 g sugar.
Answer:
No. of erasers = \(\frac{250}{10}\) = 25 g
Let Us Think (Page 119)
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. ______.
Answer:
Number of boxes for Mr. Das = \(\frac{1000}{500}\) = 2 boxes.
Question 2.
Mrs Fernandes wants the sweets in boxes weighing 250 g each. ______
Answer:
Number of boxes for Mrs Fernandes = \(\frac{1000}{250}\) = 4 boxes.
Question 3.
Mrs Khan wants the sweets in boxes weighing 100 g each.
______.
Answer:
Number of boxes for Mrs Khan = \(\frac{1000}{100}\) = 10 boxes.
Question 4.
Mr Patel wants the sweets in boxes weighing 50 g each.
______
Answer:
Number of boxes for Mr Patel = \(\frac{1000}{50}\)=20 boxes.
Weighing Machines
Do you know the different types of weighing machines used to weigh different objects?
Let Us Do (Page 120)
Question 1.
Ask your parents and find the amount of consumption of the following items at your home in a month.
Answer:
| Items | Weight |
| Atta | Do it yourself |
| Rice | Do it yourself |
| Pulses | Do it yourself |
| Sugar | Do it yourself |
Question 2.
Taran and his sister are lifting packets of flour, rice, and salt.
What do you think they are experiencing while lifting these packets?
Answer:
I think bigger packets have more weight and are difficult to lift, while small packets have less weight and are easy to lift.
Question 3.
Have you ever lifted such packets at your home? What do you experience? Discuss.
Answer:
Yes, I’ve experienced it. Small packets are easier to lift while bigger one are difficult to lift.
Let Us Do (Page 121)
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.
Answer:
Objects I can lift easily and their estimated weights
1. Book -1 kg
2. Water bottle -2 kg
3. Pillow -0.5 kg
Question 2.
Now write the names of things that you can lift with a lot of effort. Estimate and write their weights.
Answer:
Objects I can lift with efforts and their estimated weights.
1. Chair -10 kg
2. Small Table – 15 kg
3. Suitcase -20 kg
Question 3.
How many 1 kg packets are in
Answer:
(a) 10 kg : Dividing the total weight by the weight of one packet
= \(\frac{10kg}{1}\) = 10
(b) 20 kg : Dividing the total weight by the weight of one packet
= \(\frac{20kg}{1}\) = 20
(c) 50 kg : Dividing the total weight by the weight of 1 packet
= \(\frac{50kg}{1}\) = 50
(d) 25 kg : Dividing the total weight by the weight of 1 packet
= \(\frac{25kg}{1}\) = 25 m
Question 4.
Match the objects in the left column with their estimated weights in the right column.
Answer:
Measuring Capacity (Page 122)
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.
Answer:
| Less than 1 Litre | 1 Litre | More than 1 Litre |
| 1. Small water bottle 500 ml | Standard water | Large water bottle 1.5 L |
| 2. Juice box 250 ml | bottle 1 L | Pitcher 2 L |
| 3. Eye drop bottle 10 ml | Milk carton 1 L | Bucket 5 L |
| 4. Medicine cup 30 ml | Oil can 1 L | Tank 50 L |
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.
Answer:
Do yourself.
Let Us Find (Pages 123-124)
(a) How many 500 ml bottles will fill a 1 l bottle?
Answer:
500 ml + 500 ml = 1 l
1000 ml = 1 l
500 ml = \(\frac{1}{2l}\)
(b) How many 250 ml bottles will fill a 1 l bottle?
Answer:
250 ml + 250 ml + 250 ml + 250 ml=1 l
1000 ml = 1 l
250 ml = \(\frac{1}{4l}\)
(c) How many 100 ml bottles will fill a 1 l bottle?
Answer:
100 ml+100 ml+100 ml+100 ml+100 ml+100 ml+100 ml+100 ml+100 ml+100 ml
= 1000 ml = 1l
∴ ____ 100 ml = \( \frac{1}{10}\)
(d) How many
250 ml in \(\frac{1}{2l}\) = ______ 250 ml in 7 5 0 ml = ______
100 ml in \(\frac{1}{2l}\) = ______ 100 ml in 800 ml= ______
Answer:Dividing 500 ml by 250 ml = \(\frac{500}{250}\) = 2
Dividing 750 ml by 250 ml = \(\frac{750}{250}\) = 3
Dividing 500 ml by 100 ml = \(\frac{500}{100}\) = 5
Dividing 800 ml by 100 ml = \(\frac{800}{100}\) = 8
Let Us Do (Pages 124-125)
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 ______
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? ______
Answer:
Dividing 100 ml by 10 ml = \(\frac{100}{10}\) = 10 bottles
(a) Dividing 250 ml by 10 ml = \(\frac{250}{10}\) = 25 cups
(b) Dividing 500 ml by 10 ml = \(\frac{500}{10}\) = 50 cups
(c) Dividing 1000 ml by 10 ml = \(\frac{1000}{10}\) = 100 cups
Question 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?
Answer:
(a) Dividing 10 ml by 1 ml = \(\frac{10}{1}\) = 10
(b) Dividing 5 ml by 1 ml = \(\frac{5}{1}\) = 5
Question 3.
Find out how much of these liquids are used at a time.
Answer:
(a) Eye drops
Less than 1 ml at a time.
(b) Honey
Less than 20 ml at a time
(c) Cough Syrup
Less than or equal to 10 ml at a time
(d) Cooking Oil
Less than 20 ml at a time
(e) Nail Polish
Less than 1 ml at time
Question 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 ______.
Answer:
(a) No. of bottles Ms Shetty get = \(\frac{1000}{500}\)=2
(b) No. of bottles Mr Muthukumar get = \(\frac{1000}{200}\)=5
(c) No. of bottles Ms Naini get = \(\frac{1000}{100}\)=10
(d) No. of bottles Ms Kannan get = \(\frac{1000}{50}\) = 20
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 ml , and 10 ml).
Answer:
Let Us Explore (Pages 125-126)
Visit nearby shops and make a list of different items that are sold in the following quantities.
Let Us Find (Pages 126-127)
(a) How many litres of water do you drink in a day? How did you find out?
Answer:
5 L
(b) How much water can a crow drink at a time?
Answer:
10 ml
(c) How much milk do you drink in one day?
Answer:
500 ml
(d) How much water does an elephant drink in a day?
Answer:
20 L
(e) 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?
Answer:
Typically, irrigation uses the most water. Activities like brushing teeth or washing hands use relatively a small amount of water.
How much water may be used in the following activities?
(a) Water for taking a shower
Answer:
10 L-20 L
(b) Watering crops in a field
Answer:
20 L
(c) Watering flowering plants
Answer:
10 L-20 L
(d) Washing clothes
Answer:
15 L-20 L
Water Conservation in Everyday Life (Page 127)
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 lest 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?
Answer:
A slow drip from a tap can waste a surprising amount of water. In an hour, a drip could lose around 15-20 gallons of water. Over a day, that’s potentially hundreds of gallons wasted. Over a week, the wastage can reach thousands of gallons. This highlights the importance of fixing leaks to conserve water resources.
Here’s a more detailed breakdown:
1 Hour: A slow drip can lose approximately 15-20 gallons of water in an hour.
1 Day: Extrapolating this, a slow drip could waste hundreds of gallons per day.
1 Week: Over a week, the wastage can reach thousands of gallons.
Impact: This highlights the importance of fixing leaks promptly to avoid unnecessary water waste.