NCERT Solutions for Class 4 Maths Mela Chapter 7 The Cleanest Village

Page 96

Daisy and Lou Go Shopping

Sapna Dada ask Daisy and Lou to find the costs of different quantities of fruits and vegetable. Help them to complete the tasks. You may use a number line, play money or any other method to calculate.

Answer:
a) 2 kg of beans
2 kg of beans = ₹95 × 2 = ₹190

b) 1 kg of custard apple and 1 kg of sapota
1 kg of custard apple  ₹45 + 1 kg of sapota  ₹70 = ₹115

c) 1 kg of onion and 1 kg of potato
1 kg of onion ₹32 + 1 kg of potato ₹37 = ₹69

d) 1 kg of radish and 1 kg of yam
1kg of radish ₹23 + 1 kg of yam ₹45 = ₹68

e) 2 kg of radish and 2 kg of papaya
2 kg of radish 2 × ₹23  + 2 kg of papaya 2 × ₹65 = ₹176

f) 2 kg of onion and 2kg of potato
2 kg of onion 2 × ₹32 2kg of potato 2 × ₹37 = ₹138

What do you notice about these two costs?
Answer:
I have noticed that the cost of vegetables and fruits was changed according to the quantity changes.

Their mother buys things for ₹163. What might she have bought? There is more than one possibility.

Answer:
There are multiple possibilities for purchasing items that total ₹163:
► 1 kg of beans (₹95) + 1 kg of radish (₹23) + 1 kg of yam (₹45) = ₹163
► 1 kg of sapota (₹70) + 1 kg of potato (₹37) + 1 kg of onion (₹32) + 1 kg of radish (₹23) = ₹163.

Page 97

Udata Didi runs a store selling rice, atta, daal, and spices. Daisy and Lou helps Udaya Didi return the balance to customers while their mother buys the groceries. Udaya Didi also asks them some tricky questions.
Help them find the missing numbers in each of the following. Use a number line, play money or any other way to find the balances.

Answer:

Page 98

Lou and Daisy buy 3kg bananas to eat on the way with their friends. Which of the following options can they use to buy the bananas?

Answer:
Price of 1 kg bananas = ₹55 Price of 3 kg bananas = ₹55 × 3 = ₹165
Option a: 1 notes of ₹200 = ₹200 – ₹165  (sufficient, with ₹35 balance)
Option b: 1 note of ₹100, 1 note of ₹50, 1 note of ₹10, 1 coin of ₹5 = ₹165 – ₹165 (sufficient, with ₹0 balance)
Option c: 1 notes of ₹100, 1 note of ₹10 = ₹110 (insufficient by ₹55)
Option d: 20 note of ₹10 = ₹200 – ₹165  (sufficient, with ₹35 balance)
Option e: 3 note of ₹50, 1 note of ₹10 = ₹160 (insufficient by ₹5)
So options a, b and d can be used to buy 3 kg of bananas.

Page 99

A Strange Puzzle

Four naughty kids on a walk come across a fresh orange crop. They ask the farmer the price of one. The farmer says, “Each costs ₹ 21”.
Two oranges each they buy. The farmer gives them with a sigh. They all reach in to their jackets, To take out notes from their pockets.
Each one pays a different note, Krishna a ₹ 50 and Sudama a ₹ 100, Mala a ₹ 200 and Neela a ₹ 500.
What is the balance that they each got?

Answer:

Page 100

Let Us Play

Place the numbers 1-6 in the blanks in such a way that the sum on each side of the triangle is 9. No numbers should repeated.

Answer:

Use the same numbers 1-6 and make the sum 10 on each side of the triangle.

Answer:

What other sums can you make with these 6 numbers? Can you make 12 on each side? Can we make 13?
Answer:

We cannot make for 13. It requires 2-7 numbers.

Page 103

Daisy and Lou  ate one large piece of pusaw for ₹38. They liked it a lot and bought another small piece for ₹16. How much did they spend on pusaw?

Answer:

Daisy and Lou has collected ₹185 in their piggy bank. Their mother gave them ₹125 more for the trip. How much money did they take for the trip?

Answer:

Page 105

Let Us Do

1. In Kalakshity, a school of performing arts, the following number of students are learning to sing and play the tabla. Estimate and then find the total number of students.
If 15 more girls join the music school and they want to learn to play the tabla. How many girls play the tabla now?

Answer:
Total number of boys = 78 + 532 = 610
Total number of girls = 95 + 346 = 441
Total number of tabla players: 78 + 95 = 173
Total number of singers: 532 + 346 = 878
If 15 more girls join to learn tabla:
New number of girls playing tabla = 95 + 15 = 110.

2. Add by aligning the numbers in columns in your notebook.
a) 32 + 47 = 79
b) 654 + 95 = 749
c) 286 + 123 = 409
d) 476 + 324 = 800
e) 700 + 289 = 989
f) 534 + 483 = 1017
Answer:

3.  Preeti’s school has 423 children. Her school has 178 children less than her cousin’s school. How many children study in Preeti’s cousin’s school?
Answer:
Number of child in Preeti’s school = 423
Number of child in her cousin’s school = 178 + Children in Preeti’s school
= 423 + 178
= 601

Page 108

Let Us Solve

Ram Chacha got 264 mangoes from his mango tree last year. This year he got 527 mangoes. How many more mangoes did he get this year?

Answer:
Mangoes last year = 264
Mangoes this year = 527
Difference = 527 – 264 = 263
So, he got 263 more mangoes this year.

4. During the festival of dolls (Gombe Habba in Dussehra), Ranganna made 639 dolls. He was able to sell 531 dolls. How many dolls are left with him?

Answer:
Total dolls made = 639
Dolls sold out = 531
Remaining dolls = 639 – 531 = 108
So, 108 dolls are left with him.

5. Subtract by aligning the numbers in column in your notebook.
a) 83 – 29
b) 354 – 123
c) 763 – 437
d) 803 – 350
e) 900 – 328
Answer:

Page 109

Let Us Solve

1. These books are in the community library of Wakanda village. Children borrow these books to read during their vacation.

a) Rami read Panchatantra Tales during the summer vacation. Kesu read Akbar Birbal, Karadi Tales and Blue Umbrella. Who do you think read more? How many more pages?
Answer:
Rami read: Panchatantra Tales = 236 pages
Kesu read: Akbar Birbal (96 pages) + Karadi Tales (30 pages) + Blue Umbrella (90 pages) = 216 pages.
Difference = 236 – 216 = 20
So, Rami read 20 pages more than Kesu.

b) Sumi has read 23 pages of Adventures of Feluda. How many more pages are left to complete the book?
Answer:
Total number of pages in Adventures of Feluda = 128
Page already read = 23
Pages left to read = 128 – 23 = 105

c) Jaggu decides to read all the books listed here during his vacation. He has finished reading Swami and Friends, Akbar Birbal and 50 pages of Feluda in 4 weeks. How many more pages does he have to read to finish reading all the books?
Answer:
Total pages in all books = 179 + 236 + 30 + 96 + 90 + 128 = 759
Pages Jaggu has read = 179 (Swami and Friends) + 96 (Akbar Birbal) + 50 (part of Feluda) = 325
Pages left to read = 759 – 325 = 434.

2. A daily train between Delhi and Aligarh travels a distance of 131 km.
Look at the picture below and answer the questions that follow.

a) How many passengers are there on the train when it leaves Dadri?
Answer:
Passengers at start (New Delhi) = 894
At Ghaziabad: +158 boarded – 23 alighted = + 135 net change
Total after Ghaziabad = 894 + 135 = 1029 passengers
At Dadri: + 67 boarded, -75 alighted = – 8 net change
Total when leaving Dadri = 1029 – 8 = 1021 passengers

b) Find the number of people who got off the train at Aligarh.
Answer:
Since this is the final stop, all remaining passengers (1021) would get off at Aligarh.

c) Were there more people on the train in New Delhi or in Aligarh? How much more/less?
Answer:
In New Delhi: 894 passengers
In Aligarh: 1021 passengers get off
Difference: 1021 – 894 = 127
So, 127 more passengers in Aligarh.

d) How many people travelled altogether by the train?
Answer:
Total number of people who traveled
= 894 + 158 + 67
= 1119

Page 111

Let Us Solve

a) 452 + 89

Answer:

b) 641 – 273

Answer:

c. Find quick ways of solving. Think about some of the strategies you learnt in Grade 3.

Answer:

d) Solve by aligning the numbers in column in your notebook.
1. 38 + 943
2. 465 + 305
3. 435 + 462
4. 764 – 657
5. 518 – 209
6. 879 – 53
Answer:

e) Find two numbers such that their sum is 856. Find another two numbers such that their difference is 563. Make your own word problems with these numbers.

Answer:
Sum = 856
Possible pairs:
► 400 + 456 = 856
► 500 + 356 = 856
► 428 + 428 = 856
Difference = 563
Possible pairs:
► 1000 – 437 = 563
► 800 – 237 = 563
► 900 – 337 = 563.

Page 112

Number Pair Hunt

Here is a grid of numbers. There are many number pairs in this grid. A number pair has 2 numbers which are next to each other, vertically or horizontally. For example, the numbers 111 and 185 are number pairs 48 and 185 are number pairs in this grid.

1. Find the number pair whose sum is the greatest.
Answer:
Looking at adjacent number pairs:
► 225 + 143 = 367
► 321 + 63 = 384
► 300 + 111 = 411
The greatest sum is 300 + 111 = 411.

2. Find the number pair whose sum is the smallest.
Answer:
Looking at smaller numbers:
► 68 + 54 = 122
► 35 + 100 = 135
The smallest sum is 68 + 54 = 122.

3. Find the number pair whose difference is the greatest.
Answer:
Calculating large differences:
► 321 – 48 = 273
► 321 – 63 = 258
► 321 – 54 = 267
The greatest difference is 321 – 48 = 273.

4. Find the number pair whose difference is the smallest.
Answer:
The smallest difference is 68 – 54 = 14.

Page 113

The Missing Digits

Fill the missing digits below to make each of the following sums correct.

Answer:

Page 114

Let Us Do

1. Add.
a) 23 + 489 = 512
b) 105 + 295 = 400
c) 630 + 56 = 686
d) 35 + 99 = 134
e) 409 + 387 = 796
f) 67 + 76 = 143
g) 580 + 207 = 787
h) 333 + 666 = 999
i) 826 + 268 = 1094
Answer:

2. Subtract.
a) 300 – 45 = 255
b) 962 – 268 = 694
c) 706 – 209 = 497
d) 842 – 387 = 455
e) 674 – 76 = 598
f) 754 – 409 = 345
g) 403 – 245 = 158
h) 600 – 384 = 216
i) 546 – 538 = 8
Answer:

In this chapter, you read about the story of a wedding day. Wedding day of Bunny and Banno. They invited their friends to be a part of the auspicious occasion but then there are few of the friends who are coming late. The confusion begins when everyone is being served with something that they like a lot.

Have you ever been to the wedding of someone who is so close to you and what are the things that you like to have the most during the occasion most or do you like to taste everything a little? Well, this scene of the occasion is such a where the delicacies are not exactly as you had enjoyed while you were in such occasion but for them it such occasion.

Now if you remember the incidents that are happened when people served you to eat something that is more than your appetite, what have you done at that time. Yes, I believe you guessed it right you have taken it and have it because it is too rude to say no. but what if they ask you to have it again. You cannot do anything right? You have to say no or else it will be your stomach versus bomb!! Both can blast. But in the chapter, the other animals already said how much they can consume so that it won’t be rude.

There is still confusion that occurred and then it is up to your expertise to resolve this confusion to make it work and everyone can get them enough so they all can enjoy. Then once you successfully completed the task to get the answer for their confusion. You can proceed and answer some of the simple questions that are being asked in this chapter.

There is an activity that is given in the chapter to enhance your sense of judging the quantity of measurement. So if you have already understood the activity can you do a better one because I found it easy to complete. So, for the next activity, I suggest you get the 5 liters vessel and then try to fill it with the same small water bottles and then see if this method is challenging or not. In both of the cases, you will have to make the date of the work that you have done.

I hope you have not forgotten the part about how the data works. If you do forget it then check it in the previous chapter and get the idea. So, once you complete the date of both activities compare them with one another and discuss it with your friends because in the next few activities you will have to do the same things in a different manner so it is beneficial for you to complete the work earlier so that you can make an impression that you have already studied while other students in your class trying to figure it out what is going on.