NCERT class 4 maths chapter 6 The Junk Seller, solutions are provided here for students who are preparing for their final exams. These solved questions will help them to resolve all the queries and clarify their doubts for any concepts given in chapter 6. The solutions are designed by our subject experts and in accordance with CBSE syllabus(20182019).
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NCERT book Page No: 60
Question: 1
(a) What about you? Do you also find Maths difficult?
(b) What is the most difficult thing in your Maths book?
(c) What do you think is the easiest lesson?
Answer:
(a) No, Maths is not difficult if it is practiced well.
(b) All the topics are easy to me
(c) It depends on the practice. The more you practice, the more it will be easy.
NCERT book Page No: 61
Find out: how much for a cup of tea?
Question: 2
Ask people and find out the cost of a cup of tea
(a) At a tea stall
(b) At a hotel
Answer:
(a) The cost of tea at a tea stall is Rs 5
(b) The cost of tea at a hotel is Rs 10
Question: 3
(a) If a person who runs a tea stall earns Rs 30 in a day, how much will he earn in 10 days?
(b) And in a month?
Answer:
(a) Earning in a day = Rs 30 Ã— 1
Hence, earning in two days will be = Rs 30 Ã— 2
Earning in 3 days will be = Rs 30 Ã— 3
Earning in 10 days will be = Rs 30 Ã— 10
= Rs 300
(b) In a month there are 30 days
If earning in a day cost Rs 30
Then, earning in 30 days will cost = Rs 30 Ã— 30
= Rs 900
Question: 4
Find out: what is a loan?
(a) Have you ever heard of someone taking a loan? For what?
(b) How much loan was taken?
(c) How much money was paid back?
Answer:
(a) Yes, I heard a person who took a loan for his sonâ€™s education.
(b) He took Rs 100000
(c) The money paid back by him after one year is Rs 150000
Question: 5
Who has to pay back more â€“ Hariya or Babu?
Answer: For six months, Hariya should pay Rs 51
Total money paid by Hariya = Rs 51 Ã— 6
= Rs 306
But Babu pays Rs 360 after six months. Hence, Babu pays more money than Hariya.
NCERT book Page No: 62
Question: 6
How much does Kiran earn from 9 rickshaws in a day?
Answer: From 1 rickshaw she earns = Rs 20
So, from 2 rickshaws she earns = Rs 20 Ã— 2 = Rs 40
Similarly from 9 rickshaws she earns = Rs 20 Ã— 9
= Rs 180
Question: 7
For 10 rickshaws she will get Rs 20 Ã— 10 = Rs 200
So, for 9 rickshaws, she will get Rs 200 â€“ _______ = _______
Answer: For 9 rickshaws she will get Rs 200 â€“ 20
= Rs 180
NCERT book Page No: 63
Question: 8
In a week how much does Kiran earn from one rickshaw?
Answer: We know in a week, there are 7 days
Money earned by Kiran in a day = Rs 20
Hence, money earned by Kiran in a week from one rickshaw = Rs 20 Ã— 7
= Rs 140
Question: 9
Do it mentally and write the answers.
Answer:
2 Ã— 6 = 12
20 Ã— 6 = 120
2 Ã— 60 = 120
3 Ã— 42 = 126
4 Ã— 80 = 320
4 Ã— 81 = 324
9 Ã— 25 = 225
31 Ã— 9 = 279
How Much to Pay for this Junk?
Kiran has bought some junk from junk collectors
Question: 10
How much will Kiran pay for 31 kg newspaper?
Answer: 1 kg newspaper cost = Rs 5
31 kg newspaper cost = Rs 5 Ã— 31 = Rs 155
Hence, the cost of 31 kg newspaper is Rs 155
NCERT book Page No: 64
Question: 11
How much will Kiran pay for 42 kg newspaper?
Answer: For 1 kg newspaper Kiran pays = Rs 5
For 42 kg of newspaper she will pay = Rs 5 Ã— 42
= Rs 210
Hence, Kiran pays Rs 210 for 42 kg of newspaper.
Question: 12
Also find the cost of:
(a) 22 kg of plastic
(b) 23 kg of waste paper
(c) 12 kg of iron
Answer:
(a) The cost of 1 kg of plastic = Rs 10
So, the cost of 22 kg of plastic will be = Rs 10 Ã— 22
= Rs 220
(b) Rate of 1 kg of waste paper = Rs 4
Hence, the cost of 23 kg of waste paper = Rs 4 Ã— 23
= Rs 92
(c) The cost of 1 kg of iron = Rs 12
Hence, the cost of 12 kg of iron will be = Rs 12 Ã— 12
= Rs 144
Question: 13
Guess the total money Kiran will pay to the junk collectors. Will it be
â€“ More than 600
â€“ Less than 600?
Answer: Total money Kiran pays to the junk collectors are
Cost of 42 kg of newspaper = Rs 210
Cost of 22 kg of plastic = Rs 220
Cost of 23 kg of waste paper = Rs 92
Cost of 12 kg of iron = Rs 144
Therefore, total cost of all the junks = Rs 666
So, Kiran pays more than Rs 600
NCERT book Page No: 64 â€“ 66
Smart Kiran Sells the Junk
Question: 14
Kiran bought 1 kg plastic for Rs 10, but sold 1 kg plastic for Rs 12. How much money does she earn on selling 1 kg plastic?
Answer: The cost of 1 kg of plastic that Kiran bought = Rs 10
She sold 1 kg of plastic for Rs 12
Hence, she earned = Rs 12 â€“ Rs 10
= Rs 2
Question: 15
So, how much money does she earn for 63 kg?
Answer: She earns Rs 2 for 1 kg of plastic
For 63 kg of plastic she earns = Rs 2 Ã— 63
= Rs 126
Therefore, Kiran earns Rs 126 for 63 kg of plastic
This can be calculated as follows
60 
3 

2 
60 Ã— 2 
3 Ã— 2 
120 
6 
By adding the digits in last row we will get 126
Kiran sells 32 kg iron
Question: 16
How much money will Dinu pay for 32 kg iron?
Answer: The amount by which 1 kg of plastic is sold = Rs 14
Hence, the cost of 32 kg of plastic = Rs 14 Ã— 32
= Rs 448
This can be calculated as follows
30 
2 

10 
30 Ã— 10 
2 Ã— 10 
300 
20 

4 
30 Ã— 4 
2 Ã— 4 
120 
8 
By adding the bold numbers, we get the desired number
300 + 20 + 120 + 8 = 448
Hence, the money paid by Dinu for 32 kg of plastic is Rs 448
Question: 17
Kiran buys 1 kg iron for Rs 12, but sells it for Rs 14. How much does she earn when she sells 32 kg of iron?
Answer: Money earned by Kiran by selling 1 kg of iron = Rs 14 â€“ Rs 12
= Rs 2
Hence, money earned by her by selling 32 kg of iron = Rs 2 Ã— 32
= Rs 64
This can be calculated as follows:
30 
2 

2 
30 Ã— 2 
2 Ã— 2 
60 
4 
By adding the numbers in last row, we can find the desired number
60 + 4 = 64
Therefore, by selling 32 kg of iron, Kiran earn Rs 64
What will Dinu pay for 152 kg newspaper?
Question: 18
I bought 1 kg newspaper for Rs 5, but sold it for Rs 6. How much money did I earn by selling 152 kg of newspaper?
Answer: Money earned by selling 1 kg of newspaper = Selling price of newspaper â€“ Purchasing price of newspaper
= Rs 6 â€“ Rs 5
= Rs 1
Money earned by her by selling 152 kg of newspaper = Rs 1 Ã— 152
= Rs 152
Therefore, she earns Rs 152 by selling 152 kg of newspaper
What does Dinu pay for brass?
Question: 19
How much money will Dinu pay for 4 kg brass?
Answer: As per the Dinuâ€™s price list, the cost of 1 kg of brass = Rs 180
For 4 kg of brass, Dinu will pay = Rs 180 Ã— 4
= Rs 720
This can also be calculated as follows:
100 
80 

4 
100 Ã— 4 
80 Ã— 4 
400 
320 
We get the desired result by adding the digits in last row
400 + 320 = 720
Hence, for 4 kg brass Dinu pays Rs 720
NCERT book Page No: 67
Question: 20
First guess the answer and then calculate:
(a) 37 Ã— 18 =
(b) 45 Ã— 24 =
(c) 69 Ã— 52 =
(d) 77 Ã— 55 =
(e) 142 Ã— 5 =
(f) 382 Ã— 3 =
(g) 2 Ã— 175 =
(h) 4 Ã— 206 =
Answer:
(a) Here, the number will be near to 40 Ã— 20 i.e., about 800
Calculation:
30 
7 

10 
30 Ã— 10 
7 Ã— 10 
300 
70 

8 
30 Ã— 8 
7 Ã— 8 
240 
56 
Now add the digits in third and fifth row, we get
300 + 70 + 240 + 56 = 666
Therefore, 37 Ã— 18 = 666
(b) 45 Ã— 24
This number will be near to 40 Ã— 25 = 1000
Calculation:
40 
5 

20 
40 Ã— 20 
5 Ã— 20 
800 
100 

4 
40 Ã— 4 
5 Ã— 4 
160 
20 
Add the digits in third and fifth row, we get
800 + 100 + 160 + 20 = 1080
Hence, 45 Ã— 24 = 1080
(c) 69 Ã— 52
Here the number will be near to 70 Ã— 50 = 3500
Calculation:
60 
9 

50 
60 Ã— 50 
9 Ã— 50 
3000 
450 

2 
60 Ã— 2 
9 Ã— 2 
120 
18 
On adding the digits in third and fifth row, we get
3000 + 450 + 120 + 18 = 3588
Hence, 69 Ã— 52 = 3588
(d) By guessing 77 Ã— 55
The number will be near to 80 Ã— 50 = 4000
Calculation:
70 
7 

50 
70 Ã— 50 
7 Ã— 50 
3500 
350 

5 
70 Ã— 5 
7 Ã— 5 
350 
35 
On adding the numbers in third and fifth row, we get
3500 + 350 + 350 + 35 = 4235
Therefore, 77 Ã— 35 = 4235
(e) On guessing 142 Ã— 5
The number will be near to 140 Ã— 5 = 700
Calculation:
100 
40 
2 

5 
100 Ã— 5 
40 Ã— 5 
2 Ã— 5 
500 
200 
10 
By adding the numbers in last row, we get
500 + 200 + 10 = 710
Therefore, 142 Ã— 5 = 710
(f) 382 Ã— 3
The number will be near to 380 Ã— 3 = 1140 on guessing
Calculation:
300 
80 
2 

3 
300 Ã— 3 
80 Ã— 3 
2 Ã— 3 
900 
240 
6 
On adding the digits in last row, we will get
900 + 240 + 6 = 1146
So, 382 Ã— 3 = 1146
(g) 2 Ã— 175
On guessing this number will be near to 2 Ã— 175 = 350
Calculation:
100 
70 
5 

2 
100 Ã— 2 
70 Ã— 2 
5 Ã— 2 
200 
140 
10 
On adding the digits in last row, we get
200 + 140 + 10 = 350
(h) 4 Ã— 206
This number will be near to 5 Ã— 200 = 1000 on guessing
Calculation:
200 
6 

4 
200 Ã— 4 
6 Ã— 4 
800 
24 
On adding the digits in last row, we get
800 + 24 = 824
Therefore, 4 Ã— 206 = 824
Fill My Diary
Later she paid Rs 919 to the junk collectors. When she sold the junk she got these notes and coins from Dinu.
Question: 21
Find out how much she earned this time.
Answer:
18 March 2007 Money paid by Kiran = Rs 919 Money she got from Dinu Rs 100 Ã— 5 = Rs 500 Rs 50 Ã— 1 = Rs 50 Rs 20 Ã— 9 = Rs 180 Rs 10 Ã— 18 = Rs 180 Rs 5 Ã— 28 = Rs 140 Total money she got from Dinu = Rs 1050 Rs 1050 â€“ Rs 919 ___________ Total money she earned = Rs 131 = Rs 131 ___________ 
NCERT class 4 maths chapter 6 covers the topic â€“ The junk seller. Chapter wise syllabus helps to revise the concepts at your speed and practice to perfection. NCERT publishes textbooks prescribed by the Central Board Of Secondary Education (CBSE). BYJUâ€™S offers a platform for students with all the study materials such as textbooks, notes, question papers, etc.Â
To provide good practice and detailed understanding of each concept,Â CBSE class 4 maths worksheetsÂ are also provided here, which gives a thorough insight of thoughts explained in the chapter, such as The Junk Seller. Below are some of the example questions;
Q1. Do it mentally:
 3 x 81 = ____
 10 x 6 = ____
Q2. Answer true or false:
 4 x 81 is 4 more than 4 x 80?
Also, solve some more maths questions related to this chapter, The junk seller and get your doubts clear with the help of solved examples.
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