NCERT Solutions for Class 4 Maths Mela Chapter 08 Weigh It Pour It

Question 1. Look at the pictures given and write the names of the animals from heaviest to lightest.
Answer: Elephant, Giraffe, Dog, Squirrel, Rat.
In simple words: Start with the biggest animal and go down to the smallest one.

Exam Tip: When ordering animals by weight, think about which ones you see in real life and compare their sizes - the bigger ones are almost always heavier.

Question 2. Write the name of the heaviest object in your home. How did you know?
Answer: The heaviest object in my home is an Almirah (cupboard). I know it's the heaviest because it cannot be moved by just one person and needs several people working together to lift it.
In simple words: Pick something at home that is hard to move. If many people are needed to lift it, then it's very heavy.

Exam Tip: Look for furniture or large items that require multiple people to move - these are usually the heaviest things in a home.

Question 3. Do you carry your school bag with ease or with some efforts?
Answer: I carry my school bag with some effort because it has several books and notebooks packed inside it.
In simple words: If your bag has lots of books, it will feel heavy and you need to work hard to carry it.

Exam Tip: This question tests your ability to describe personal experience - describe how much strength you use when lifting your bag.

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 Mathematics textbook. I know it's the heaviest because when I hold it by itself, it feels much heavier compared to all my other books.
In simple words: Pick up each book separately and see which one weighs the most.

Exam Tip: Textbooks with more pages are typically heavier - try holding different books to compare their weights.

Question 5. What is your weight? How did you know?
Answer: My weight is approximately 32 kg. I know this because I measured it using a weighing scale at home.
In simple words: Step on a weighing scale and read the number shown - that is your weight.

Exam Tip: Always use an accurate weighing scale to find your weight, and remember that weight changes as you grow older.

Fun at Vegetable Market

Question 6. 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?
Answer: Yes, the weight of half a pumpkin would be roughly 1 to 2 kg.
In simple words: If a whole pumpkin is very heavy, then half of it would weigh somewhere between 1 and 2 kilograms.

Exam Tip: When estimating weights, think about how heavy a whole object is, then imagine cutting it in half to estimate the new weight.

Let Us Do

Question 7. Estimate the weight of the following and put a tick mark (\( \checkmark \)) in the appropriate cell. Try to verify if your guess is correct by using a weighing balance.
Answer: This is a practical activity where you need to guess the weights of fruits and vegetables like 6 bananas, 5 potatoes, 10 tomatoes, and 15 onions. Your estimates should be checked against the actual weights using a balance scale. For example, 6 bananas are typically less than 1 kg, while 10 tomatoes may weigh more than 1 kg depending on their size.
In simple words: Make a guess about how heavy something is, then weigh it to see if your guess was close.

Exam Tip: Build your estimation skills by regularly comparing your guesses with actual measurements - this helps you judge weights better over time.

Understanding Grams and Kilograms in Class 4 Maths Mela

Question 8. How many 250 g daal packets will balance one 500 g daal packet?
Answer: Two packets of 250 g will balance one 500 g packet. This is because 250 g + 250 g equals 500 g.
In simple words: If you put two 250 g packets on one side of a balance, they will weigh the same as one 500 g packet on the other side.

Exam Tip: Use a balance scale to show that 2 × 250 g = 500 g, helping you understand how smaller weights add up to make larger ones.

Question 9. Draw arrows to indicate which side the pan balance will tilt. One is shown for you.
Answer: (a) The balance with soap packets on the left will tip down on the left side. (b) When salt is on one side and chocolates on the other, the side with chocolates will go down. (c) The Haldi (turmeric) packets are lighter, so the salt side will go down. (d) Both sides have equal weight, so the balance remains level.
In simple words: Look at what is on each side of the balance. The heavier side will go down and the lighter side will go up.

Exam Tip: Compare the weights you can see in the picture - the side with more items or heavier items will always tilt downward.

Question 10. Match the unit convenient for measuring each of the following objects.
Answer: A baby should be measured in Kilograms. A box of chocolate should be measured in Grams. A drawing pin should be measured in Grams. A book should be measured in Grams. A refrigerator should be measured in Kilograms. A pen should be measured in Grams. A leaf should be measured in Grams. A wooden chair should be measured in Kilograms.
In simple words: Use grams for small, light things and kilograms for big, heavy things.

Exam Tip: Remember - if something is smaller than your hand or feels very light, measure it in grams. If something is as big as furniture or a person, measure it in kilograms.

Let Us Do

Question 11. How many erasers will weigh the same as a 50 g Haldi packet?
Answer: 5 erasers will weigh the same as a 50 g Haldi packet.
In simple words: Each eraser weighs about 10 grams, so 5 of them together weigh 50 grams.

Exam Tip: If you know the weight of one object, multiply it by the number of objects to find the total weight.

Question 12. A 100 g soap bar will weigh the same as __________ erasers.
Answer: A 100 g soap bar will weigh the same as 10 erasers.
In simple words: Since one eraser weighs 10 grams, you need 10 erasers to equal 100 grams.

Exam Tip: Divide the total weight by the weight of one eraser to find how many erasers you need.

Question 13. _________ erasers will weigh the same as 250 g sugar.
Answer: 25 erasers will weigh the same as 250 g sugar.
In simple words: If each eraser weighs 10 grams, then 25 erasers together weigh 250 grams.

Exam Tip: Use the relationship 250 ÷ 10 = 25 to find the number of erasers needed.

Let Us Think

Question 14. 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.
Answer: (a) Mr Das wants the sweets in boxes weighing 500 g each - 2 boxes are needed. (b) Mrs Fernandes wants the sweets in boxes weighing 250 g each - 4 boxes are needed. (c) Mrs Khan wants the sweets in boxes weighing 100 g each - 10 boxes are needed. (d) Mr Patel wants the sweets in boxes weighing 50 g each - 20 boxes are needed.
In simple words: Divide 1000 grams by the size of each box to find how many boxes you need to fill.

Exam Tip: Always remember that 1 kg = 1000 g. Divide 1000 by the box size to find the number of boxes.

Real-Life Applications in Class 4 Maths Mela Weigh It, Pour It

Question 15. Do you know the different types of weighing machines used to weigh different objects?
Answer: There are five main types of weighing machines: (a) A balance scale (beam balance) - used to compare weights of two objects. (b) A baby weighing scale - used to measure a baby's weight. (c) A hanging scale - used in shops to weigh items. (d) A traditional market scale with weights - used by vegetable sellers. (e) A personal weighing scale - used to measure body weight at home.
In simple words: Different scales are used for different things - a balance scale for comparing, a hanging scale for shopping, and a floor scale for measuring your body weight.

Exam Tip: Know which weighing machine is best for each purpose - this helps you choose the right tool for accurate measurements.

Question 16. Ask your parents and find the amount of consumption of the following items at your home in a month.
Answer: A sample answer might include: Atta (flour) - 10 kg per month, Rice - 8 kg per month, Pulses - 3 kg per month, Sugar - 2 kg per month. These amounts can vary depending on family size and eating habits.
In simple words: Ask your parents how much food they buy each month, then write down the weights.

Exam Tip: When collecting this data, ask about actual quantities purchased or weights shown on packages to get accurate information.

Question 17. Taran and his sister are lifting packets of flour, rice, and salt. What do you think they are experiencing while lifting these packets?
Answer: When lifting heavier packets, more effort and strength are required. Some packets are easier for Taran to lift while his sister finds them harder. The way the weight is spread inside the packet affects how simple or difficult it becomes to carry it.
In simple words: Heavier things need more muscle power to lift. Things that weigh the same but are shaped differently might feel easier or harder to carry.

Exam Tip: Understand that weight and effort are connected - the heavier something is, the harder it is to lift and carry.

Question 18. Have you ever lifted such packets at your home? What do you experience?
Answer: When lifting heavy packets at home, I need to use both hands. For very heavy packages, I sometimes require help from grown-ups to lift them properly.
In simple words: Heavier things need both hands to lift safely, and very heavy things need adult help.

Exam Tip: Always ask for help when lifting heavy items - this is both safe and shows good judgment.

Let Us Do

Question 19. 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: Examples of objects you can lift easily: a pencil box (around 200 g), a water bottle (around 500 g), and a lunchbox (around 300 g). These objects are light enough for a child to pick up without difficulty.
In simple words: Find light things at home that you can easily pick up with one hand.

Exam Tip: When estimating weights, compare objects with things you know - if something feels as heavy as a water bottle, it probably weighs around 500 g.

Question 20. Now write the names of things that you can lift with a lot of effort. Estimate and write their weights.
Answer: Examples of heavier objects that need more effort: a school bag filled with books (around 4 kg), a chair (around 5 kg), and a medium-sized bucket filled with water (around 8 kg). These items require significant strength to lift.
In simple words: Find heavy things at home that are hard to pick up because they weigh a lot.

Exam Tip: Objects that need both hands or help from others are usually in the kilogram range rather than grams.

Question 21. How many 1 kg packets are in: (a) 10 kg, (b) 20 kg, (c) 50 kg, (d) 25 kg?
Answer: (a) 10 kg contains 10 packets of 1 kg each. (b) 20 kg contains 20 packets of 1 kg each. (c) 50 kg contains 50 packets of 1 kg each. (d) 25 kg contains 25 packets of 1 kg each.
In simple words: The number of 1 kg packets you need equals the total weight in kilograms.

Exam Tip: This is a simple division - divide the total kg by 1 kg to find how many packets you have.

Question 22. Match the objects in the left column with their estimated weights in the right column.
Answer: A cat weighs 1 g to 5 g - No, it should be matched with 3 kg to 5 kg. An elephant weighs 150 kg to 300 kg - Correct match. A 1 litre filled bottle weighs 3 kg to 5 kg - No, it should be 1 kg or less. A tiger weighs 10 g to 15 g - No, it should be 150 kg to 300 kg. An empty gas cylinder weighs 6 kg to 10 kg - Correct match. A pen weighs More than 1000 kg - No, it should be 10 g to 15 g. A leaf weighs 15 kg - No, it should be 1 g to 5 g. A wooden chair weighs 800 g to 1000 g - Correct match.
In simple words: Match each thing on the left with the weight range on the right that makes the most sense.

Exam Tip: Think about the size and material of each object to estimate its weight - bigger and heavier materials weigh more.

Measuring Capacity

Question 23. Do you remember the 1 litre bottle? How much water does your water bottle hold? Find the 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 containers: Coffee Mug, Tea Cup, Small Bowl. Containers that hold exactly 1 litre: Water Bottle, Milk Packet, Juice Bottle. Containers that hold more than 1 litre: Bucket, Water Jug, Cooking Pot.
In simple words: Some containers hold less water than a litre, some hold exactly one litre, and some hold more than one litre.

Exam Tip: A litre is the standard unit - compare each container's size to a 1 litre bottle to place it in the right column.

Let Us Find

Question 24. (a) How many 500 ml bottles will fill a 1 l bottle?
Answer: 2 bottles of 500 ml will fill one 1 litre bottle because 2 × 500 ml = 1000 ml = 1 l.
In simple words: Two 500 ml bottles together make one litre.

Exam Tip: Remember that 1000 ml = 1 litre. Divide 1000 by the bottle size to find how many bottles you need.

Question 25. (b) How many 250 ml bottles will fill a 1 l bottle?
Answer: 4 bottles of 250 ml will fill one 1 litre bottle because 4 × 250 ml = 1000 ml = 1 l.
In simple words: Four 250 ml bottles together make one litre.

Exam Tip: Use multiplication - if 4 bottles of 250 ml fill a litre, then 250 ml × 4 = 1000 ml.

Question 26. (c) How many 100 ml bottles will fill a 1 l bottle?
Answer: 10 bottles of 100 ml will fill one 1 litre bottle because 10 × 100 ml = 1000 ml = 1 l.
In simple words: Ten 100 ml bottles together make one litre.

Exam Tip: The smaller the bottle size, the more bottles you need to make a litre.

Question 27. (d) How many 250 ml in 1/2 l? How many 250 ml in 750 ml? How many 100 ml in 1/2 l? How many 100 ml in 800 ml?
Answer: 250 ml in 1/2 l = 2 bottles (since 1/2 l = 500 ml, and 500 ÷ 250 = 2). 250 ml in 750 ml = 3 bottles (since 750 ÷ 250 = 3). 100 ml in 1/2 l = 5 bottles (since 500 ÷ 100 = 5). 100 ml in 800 ml = 8 bottles (since 800 ÷ 100 = 8).
In simple words: Divide the total millilitres by the size of each bottle to find how many bottles fit.

Exam Tip: Half a litre (1/2 l) equals 500 ml - use this fact to solve these problems quickly.

Let Us Do

Question 28. Find a dosing cup or a bottle of 10 ml and try to find how many 10 ml will fill a 100 ml bottle.
Answer: 10 dosing cups of 10 ml each will fill a 100 ml bottle because 10 × 10 ml = 100 ml.
In simple words: You need ten 10 ml cups to fill a 100 ml bottle.

Exam Tip: Practice this with real bottles and measuring cups to better understand capacity relationships.

Question 29. Find how many 10 ml dosing cups will fill a 250 ml glass?
Answer: 25 dosing cups of 10 ml each will fill a 250 ml glass because 25 × 10 ml = 250 ml.
In simple words: You need 25 small 10 ml cups to fill a 250 ml glass.

Exam Tip: Divide 250 by 10 to find the number of dosing cups needed quickly.

Question 30. Find how many 10 ml dosing cups will fill a 500 ml vessel?
Answer: 50 dosing cups of 10 ml each will fill a 500 ml vessel because 50 × 10 ml = 500 ml.
In simple words: You need 50 small 10 ml cups to fill a 500 ml vessel.

Exam Tip: Larger containers need more small cups - here 500 ml needs 50 cups of 10 ml each.

Question 31. Find how many 10 ml dosing cups will fill a 1 l bottle?
Answer: 100 dosing cups of 10 ml each will fill a 1 litre bottle because 100 × 10 ml = 1000 ml = 1 l.
In simple words: You need 100 small 10 ml cups to fill a 1 litre bottle.

Exam Tip: Remember 1000 ml = 1 litre, so divide 1000 by 10 to get 100 cups.

Question 32. Take a 1 ml dropper and find out how many 1 ml droppers will fill a 10 ml dosing cup?
Answer: 10 droppers of 1 ml each will fill a 10 ml dosing cup because 10 × 1 ml = 10 ml.
In simple words: You need 10 small drops to fill one dosing cup.

Exam Tip: A 1 ml dropper is very small - it takes 10 of them to fill just one dosing cup.

Question 33. How many droppers will fill a teaspoon?
Answer: 5 droppers of 1 ml each will fill a teaspoon because a teaspoon typically holds about 5 ml.
In simple words: A teaspoon holds about 5 drops of medicine or liquid.

Exam Tip: A teaspoon is used in cooking and holds 5 ml - this is useful to remember for measuring medicines.

Question 34. Find out how much of these liquids are used at a time: (a) Eye drops, (b) Honey, (c) Cough Syrup, (d) Cooking Oil.
Answer: (a) Eye drops: Less than 1 ml at a time - just a tiny drop goes into each eye. (b) Honey: About 10 to 15 ml (one tablespoon) when used as a sweetener. (c) Cough Syrup: About 5 to 10 ml (one or two teaspoons) - this is the typical dose. (d) Cooking Oil: About 10 to 30 ml when cooking a single dish - this depends on what you are making.
In simple words: Different liquids are used in different amounts - some need just a drop, others need a spoonful.

Exam Tip: Remember typical amounts - medicines use drops or teaspoons, while cooking uses more oil than eye drops.

Question 35. 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.
Answer: Ms Shetty will get 2 bottles of 500 ml each because 2 × 500 ml = 1000 ml = 1 l.
In simple words: Two 500 ml bottles together equal one litre.

Exam Tip: Always divide 1000 ml by the bottle size to find how many bottles make a litre.

Question 36. (b) Mr. Muthukumar wants bottles of 200 ml each.
Answer: Mr. Muthukumar will get 5 bottles of 200 ml each because 5 × 200 ml = 1000 ml = 1 l.
In simple words: Five 200 ml bottles together equal one litre.

Exam Tip: For 200 ml bottles, divide 1000 by 200 to quickly find that you need 5 bottles.

Question 37. (c) Ms. Naini wants bottles of 100 ml each.
Answer: Ms. Naini will get 10 bottles of 100 ml each because 10 × 100 ml = 1000 ml = 1 l.
In simple words: Ten 100 ml bottles together equal one litre.

Exam Tip: When bottles are 100 ml, you always need 10 bottles to make a litre.

Question 38. (d) Ms. Kannan wants bottles of 50 ml each.
Answer: Ms. Kannan will get 20 bottles of 50 ml each because 20 × 50 ml = 1000 ml = 1 l.
In simple words: Twenty 50 ml bottles together equal one litre.

Exam Tip: The smaller the bottle size, the more bottles you need - 50 ml bottles need 20 of them.

Question 39. Estimate and verify by measuring. Use the bottles you have collected for this purpose (for examples, 500 ml, 250 ml, 100 ml, 50 ml, and 10 ml).
Answer: This is a practical activity where you should collect different sized bottles and estimate how many of each size will fill a 1 litre container. Then measure by pouring water from each bottle into the 1 litre bottle to verify your estimates and check if your predictions were correct.
In simple words: Guess how many bottles you need, then actually fill the container to check if you were right.

Exam Tip: This hands-on activity helps you understand capacity better than just doing calculations.

Let Us Explore

Question 40. 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.
Answer: Examples include: 50 ml - Perfume and Shampoo; 100 ml - Sanitizer and Cough Syrup; 200 ml - Water Bottle and Vegetable Oil; 250 ml - Mango Juice and Butter Milk; 500 ml - Mustard Oil and Soy Sauce; 900 ml - Sunflower Oil and Dishwash Liquid.
In simple words: Different products come in different sized bottles - small ones like perfume and large ones like cooking oil.

Exam Tip: When shopping with parents, notice the sizes printed on bottles - this helps you learn about real-world capacity measurements.

Let Us Find

Question 41. (a) How many litres of water do you drink in a day? How did you find out?
Answer: I drink about 2 litres of water in a day. I found this out by counting how many glasses I drink - if I drink about 8 glasses and each glass holds 250 ml, then 8 × 250 ml = 2000 ml = 2 litres.
In simple words: Count how many glasses of water you drink and multiply by the size of each glass.

Exam Tip: A standard glass usually holds 250 ml - use this to estimate your daily water intake.

Question 42. (b) How much water can a crow drink at a time?
Answer: A crow can drink about 10 to 15 ml of water at a time because it has a small body and can only take tiny sips.
In simple words: A crow is a small bird so it drinks only a few millilitres when it has water.

Exam Tip: Smaller animals drink smaller amounts - a crow drinks only drops, while an elephant drinks litres.

Question 43. (c) How much milk do you drink in one day?
Answer: I drink about 300 ml of milk in one day, which is a bit less than two standard glasses of 250 ml each.
In simple words: Most children drink between one and two glasses of milk daily.

Exam Tip: Milk is usually served in glasses similar to water - each glass is typically 250 ml.

Question 44. (d) How much water does an elephant drink in a day?
Answer: An elephant drinks about 150 to 200 litres of water in a day because it is a very large animal with a big body.
In simple words: Elephants are huge animals and need to drink many, many litres of water every day.

Exam Tip: Compare body size to water intake - larger animals always drink more water than smaller animals.

Question 45. 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: When thinking about daily activities that need water - bathing, drinking, washing hands, flushing toilets, and watering plants - I use the most water for bathing or showering and for flushing toilets. I use the least water for brushing teeth or washing hands. When comparing with classmates, most friends have similar water usage patterns for these activities.
In simple words: Bathing and toilet flushing use lots of water, but brushing teeth uses very little. Most people use water the same way.

Exam Tip: Think about conservation - activities that use lots of water should be done efficiently to save water.

Page 127

Question 1. 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) _________________
Answer:
(a) Water for taking a shower: About 20-30 liters.
(b) Watering crops in a field: About 2000-5000 liters (depending on field size).
(c) Watering flowering plants: About 1-2 liters per plant.
(d) Washing clothes: About 15-20 liters for hand washing or 50-100 liters for machine washing.
(e) Washing hands: About 1-2 liters.
(f) Brushing teeth: About 1-2 liters.
In simple words: A shower uses around 20-30 liters. Crops need much more - between 2000-5000 liters depending on the field. Flowers and plants need only 1-2 liters each. Hand washing clothes takes 15-20 liters, but using a machine needs 50-100 liters. Washing your hands or brushing teeth uses about 1-2 liters.

Exam Tip: Learn the typical ranges for common activities - shower, field watering, and machine washing are usually the highest consumers and should be memorized for quick recall.

Water Conservation in Everyday Life

Question 2. 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?
Answer: Yes, a small drip wastes about 200-500 ml in an hour, depending on how large the drip is. This may seem like very little at first, but it quickly becomes a major problem when you look at what happens over days and weeks. Even tiny leaks add up to enormous quantities of water lost over time.
In simple words: A small drip from a tap or water purifier leaks about 200-500 ml every hour. This seems small, but it wastes a lot of water over days and weeks.

Exam Tip: Always quantify the wastage - specific numbers (ml per hour, liters per day) are more impressive in answers than just saying "water is wasted".

Question 3. 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?
Answer: When you place a container under a leaking tap or water purifier for one hour, you will collect about 150-300 ml of water. Most students find this amount shocking because a single drip appears so insignificant, yet the container fills up noticeably. This simple experiment opens students' eyes to how much water we waste without even realizing it.
In simple words: One hour of slow dripping collects about 150-300 ml in a container. This is more water than many people expect from just a tiny drip.

Exam Tip: Conduct this activity yourself and record your own results - examiners often ask for observations from hands-on experiments, and your own measurements show you understand the concept.

Question 4. How much water is lost in a day?
Answer: If a single tap drips continuously for 24 hours, approximately 5-12 liters of water are wasted in just one day. This is a much larger volume than what collects in an hour, and it shows how rapidly small leaks become significant water loss over longer time periods.
In simple words: A slow drip wastes about 5-12 liters of water each day. That is enough to fill several large bottles.

Exam Tip: Compare daily, weekly, and yearly water loss to show the scale of the problem - this helps examiners see you understand long-term environmental impact.

Question 5. How much do you think is lost in a week?
Answer: Over a full week, a continuous slow drip will waste between 35-84 liters of water. This enormous quantity represents the amount you would need to fill multiple buckets, highlighting just how serious even small leaks become when left unfixed. A single unrepaired dripping tap in a home can squander an entire swimming pool's worth of water in a year.
In simple words: In one week, a slow drip loses about 35-84 liters. That is like wasting many big buckets of water every single week.

Exam Tip: Calculate or estimate yearly losses by multiplying weekly losses by 52 - this demonstrates mathematical skill and shows the scale of the annual wastage problem.

Question 6. How would this wastage of water affects us?
Answer: Water wastage has several serious consequences:

• It causes our water bills to rise unnecessarily, wasting family money.
• It depletes our limited supply of drinking water, which is already scarce in many regions.
• It leads to water shortages, making water unavailable for people who truly need it.
• It creates environmental damage, harming ecosystems and wildlife that depend on clean water.
• It reduces the water available for vital purposes like farming, cooking, and sanitation.

Exam Tip: Mention both personal impacts (higher bills) and community/environmental impacts (scarcity, ecosystem damage) to show you understand the broader consequences - answers covering only one aspect typically score partial marks.