Class 4 Maths Mela Chapter 7 The Cleanest Village NCERT Solutions

Class 4 Maths Mela Chapter 7 The Cleanest Village NCERT Solutions provide solutions with illustrations to the problems discussed in Chapter 7 of the Maths Mela textbook. These solutions discuss questions related to money transactions, adding and subtracting numbers to get the value of things, calculating the balance to be received while paying-off for items bought, adding and subtracting numbers by placing them in a column, finding the missing digits in numbers to make the subraction and addition correct and placing numbers along the sides of a triangle such that the sum on each side is same.

Class 4 Maths Mela Chapter 7 The Cleanest Village Questions Answers – PDF Download

Daisy and Lou Go Shopping (Page 96 – 98)

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

Solution:
(i) 2 kg of beans = ₹ 95 + ₹ 95 = ₹ 190.

(ii) 1 kg custard apple and 1 kg of sapota = ₹ 45 + ₹ 70 = ₹ 115.

(iii) 1 kg of onion and 1 kg of potato = ₹ 32 + ₹ 37 = ₹ 69.

(iv) 1 kg of radish and 1 kg of yam = ₹ 23 + ₹ 45 = ₹ 68.

(v) 2 kg of radish and 2 kg of papaya = ₹ 23 + ₹ 23 + ₹ 65 + ₹ 65 = ₹ 176.

(vi) 2 kg of onion and 2 kg of potato = ₹ 32 + ₹ 32 + ₹ 37 + ₹ 37 = ₹ 138.

We noticed that the cost of 2 kg of onion and 2 kg of potato (₹138) is double the cost of 1 kg of onion and 1 kg of potato (₹69).

Q. Their mother buys things for ₹ 163. What might she have bought? There is more than one possibility.
Solution:
The mother might have brought 1 kg of custard apple, 1 kg of radish, 1 kg of onion and 1 kg of papaya because the total cost of all these items = 45 + 23 + 32 + 63 = ₹ 163.

Q. Udaya Didi runs a store selling rice, atta, daal, and spices. Daisy and Lou help 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.

Solution:

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

Solution:
Cost of 1 kg bananas = ₹ 55
Cost of 3 kg bananas = ₹ 55 + ₹ 55 + ₹ 55 = ₹ 165.
Therefore, Lou and Daisy can use option (b) to buy the bananas.

A Strange Puzzle (Page 99)

Q. 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?

Solution:
(i) Krishna
Cost of 2 oranges: ₹ 21 + ₹ 21 = ₹ 42.
Paid: ₹ 50
Balance: ₹ 50 – ₹ 42 = ₹ 8.

(ii) Sudama
Cost of 2 oranges: ₹ 21 + ₹ 21 = ₹ 42.
Paid: ₹ 100
Balance: ₹ 100 – ₹ 42 = ₹ 58.

(iii) Mala
Cost of 2 oranges: ₹ 21 + ₹ 21 = ₹ 42.
Paid: ₹ 200
Balance: ₹ 200 – ₹ 42 = ₹ 158.

(iv) Neela
Cost of 2 oranges: ₹ 21 + ₹ 21 = ₹ 42.
Paid: ₹ 500.
Balance: ₹ 500 – ₹ 42 = ₹ 458.

Let Us Play (Page 100)

Q. 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 be repeated.

Solution:

Here, 3 + 4 + 2 = 9
2 + 6 + 1 = 9
3 + 5 + 1 = 9

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

Solution:

Here, 3 + 2 + 5 = 10
5 + 4 + 1 = 10
3 + 6 + 1 = 10

Q. What other sums can you make with these 6 numbers?
Solution:
The other sum that can be made with these 6 numbers is 11.

Here, 4 + 5 + 2 = 11
2 + 3 + 6 = 11
4 + 1 + 6 =11.

Q. Can you make 12 on each side? Can you make 13?
Solution:
class 4 maths mela chapter 7 the cleanest village image 12

Here, 4 + 3 + 5 = 12
5 + 1 + 6 = 12
4 + 2 + 6 = 12.
No, it is not possible to make the sum 13 on each side of a triangle.

Add Up (Page 101 – 104)

Q. 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?

Solution:

Therefore, Daisy and Lou spent ₹ 54 on pusaw.

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

Solution:

Therefore, Daisy and Lou took ₹ 310 for the trip.

Let Us Do (Page 105)

1. In Kalakshitij, 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.

15 more girls join the music school and they want to learn to play the tabla. How many girls play the tabla now?
Solution:

Girls playing the table, initially = 95
New girls who joined to play the table = 15
Number of girls playing table now = 95 + 15 = 110.

2. Add by aligning the numbers in columns in your notebook.
(a) 32 + 47
(b) 654 + 95
(c) 286 + 123
(d) 476 + 324
(e) 700 + 289
(f) 534 + 483
Solution:
(a) 32 + 47

(b) 654 + 95

(c) 286 + 123

(d) 476 + 324

(e) 700 + 289

(f) 534 + 483

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?
Solution:
Preeti’s cousin’s school has 178 more more children than Preeti’s school.
Children in Preeti’s school = 423.
Children in Preeti’s cousin’s school = 423 + 178 = 601.

Let Us Solve (Page 108 – 109)

Q. 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?

Solution:
The difference in the number of mangoes between this year and last year = 527 – 264.

Therefore, Ram Chacha got 263 more mangoes this year than last 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?
No. of dolls left = _____________________

Solution:
No. of dolls left = 639 – 531

Therefore, 108 dolls are left with Ranganna.

5. Subtract by aligning the numbers in columns in your notebook.
a) 83 – 29
b) 345 – 123
c) 763 – 437
d) 803 – 350
e) 900 – 328
Solutions:
a) 83 – 29

b) 345 – 123

c) 763 – 437

d) 803 – 350

e) 900 – 328

Let Us Solve (Page 109 – 111)

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?
Solution:
No. of Pages read by Rami = 236.
No. of Pages read by Kesu = 96 + 30 + 90 = 216.
Rami read 20 more pages than Kesu.

b) Sumi has read 23 pages of Adventures of Feluda. How many more pages are left to complete the book?
Solution:
No. of pages in the book of Adventures of Feluda = 128.
No. of pages read by Sumi = 23.

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?
Solution:
Total pages of all books altogether = 179 + 236 + 30 + 96 + 90 + 128 = 759.
No. of pages read = 179 + 96 + 50 = 325.
No. of pages left to be read = 759 – 325 = 434.

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

(a) How many passengers are there on the train when it leaves Dadri?
Solution:
No. of passengers on the train when it left New Delhi = 894.
No. of passengers on the train when it left Ghaziabad = 894 + 158 – 23 = 1029.
No. of passengers on the train when it left Dadri = 1029 + 67 – 75 = 1021.

(b) Find the number of people who got off the train at Aligarh.
Solution:
All 1021 passengers got off the train at Aligarh because it was the last station of the train from Delhi to Aligarh.

(c) Were there more people on the train in New Delhi or in Aligarh? How much more/less?
Solution:
No. of passengers on the train in Delhi = 894.
No. of passengers in the train in Aligarh = 0
Therefore, there were 894 more people on the train in New Delhi than in Aligarh.

(d) How many people travelled altogether by the train?
Solution:
Total people who travelled altogether by the train = 894 + 158 + 67 = 1119.

Let Us Solve (Page 111 – 112)

a.

Solution:

b.

Solution:

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

Solution:
(i) 326 + 25 = 325 + 1 + 25 = 350 + 1 = 351.

(ii) 410 – 12 = 410 – 10 – 2 = 400 – 2 = 398.

(iii) 675 + 5 = 670 + 5 + 5 = 670 + 10 = 680.

(iv) 204 – 10 = 204 – 4 – 6 = 200 – 6 = 194.

(v) 811 + 99 = 811 + 100 – 1 = 911 – 1 = 910.

(vi) 945 – 19 = 945 – 20 + 1 = 925 + 1 = 926.

d. Solve by aligning the numbers in columns in your notebook.
1. 38 + 943
Solution:

2. 465 + 305
Solution:

3. 435 + 462
Solution:

4. 764 – 657
Solution:

5. 518 – 209
Solution:

6. 879 – 53
Solution:

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.

Solution:
(i) 856 = 428 + 428
Aditya and Pankaj collected 856 rupees for a charity event. If both collected the same amount of money, how much did each collect?

(ii) 563 = 800 – 237
A library had 800 books. After donating 237 books to another school, how many books were left in the library?

Number Pair Hunt (Page 112 – 113)

Q. 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.
2. Find the number pair whose sum is the smallest.
3. Find the number pair whose difference is the greatest.
4. Find the number pair whose difference is the smallest.
Solution:
Number pairs in the grid: (35, 100), (100, 179), (179, 68), (111, 185), (185, 143), (143, 54), (300, 48), (48, 225), (225, 190), (54, 321), (321, 63) , (63, 167), (35, 111), (111, 300), (300, 54), (100, 185), (185, 48), (48, 321), (179, 143), (143, 225), (225, 63) , (68, 54), (54, 190), (190, 167).
Total number of pairs in this grid = 24.
Yes, we should check every number pair to find out which is the largest sum or difference.

1. The number pair whose difference is the smallest is (68, 54), as the difference is 68 – 54 = 14.

2. The number pair with the greatest sum is (225, 190), as their sum is 225 + 190 = 415.

3. The number pair with the smallest sum is (68, 54), as their sum is 68 + 54 = 122.

4. The number pair whose difference is the greatest is (48, 321), as the difference is 321 – 48 = 273.

The Missing Digits (Page 113)

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

Solution:

Let Us Do (Page 114)

1. Add.
a) 23 + 489
Solution:

b) 105 + 295
Solution:

c) 630 + 56
Solution:

d) 35 + 99
Solution:

e) 409 + 387
Solution:

f) 67 + 76
Solution:

g) 580 + 207
Solution:

h) 333 + 666
Solution:

i) 826 + 268
Solution:

2. Subtract.
a) 300 – 45
Solution:

b) 962 – 268
Solution:

c) 706 – 209
Solution:

d) 842 – 387
Solution:

e) 674 – 76
Solution:

f) 754 – 409
Solution:

g) 403 – 245
Solution:

h) 600 – 384
Solution:

i) 546 – 538
Solution: