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 about any concepts given in Chapter 6. These NCERT Solutions are designed by our subject experts and are in accordance with the CBSE syllabus (2023-2024).
NCERT Solution for Class 4 Maths Chapter 6
Access Ncert Solution for Class 4 Maths Chapter 6
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 practised well.
(b) All the topics are easy for 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 × 1
Hence, earnings in two days will be = Rs 30 × 2
Earnings in 3 days will be = Rs 30 × 3
Earnings in 10 days will be = Rs 30 × 10
= Rs 300
(b) In a month, there are 30 days.
If earning in a day costs Rs 30,
Then, earnings in 30 days will cost = Rs 30 × 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 of a person who took a loan for his son’s education.
(b) He took Rs 1,00,000.
(c) The money paid back by him after one year is Rs 1,50,000.
Question: 5
Who has to pay back more – Hariya or Babu?
Answer: For six months, Hariya should pay Rs 51.
Total money paid by Hariya = Rs 51 × 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 × 2 = Rs 40
Similarly, from 9 rickshaws, she earns = Rs 20 × 9
= Rs 180
Question: 7
For 10 rickshaws, she will get Rs 20 × 10 = Rs 200
So, for 9 rickshaws, she will get Rs 200 – _______ = _______
Answer: For 9 rickshaws, she will get Rs 200 – 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 × 7
= Rs 140
Question: 9
Do it mentally and write the answers.
Answer:
2 × 6 = 12
20 × 6 = 120
2 × 60 = 120
3 × 42 = 126
4 × 80 = 320
4 × 81 = 324
9 × 25 = 225
31 × 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 × 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 × 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 × 22
= Rs 220
(b) Rate of 1 kg of waste paper = Rs 4
Hence, the cost of 23 kg of waste paper = Rs 4 × 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 × 12
= Rs 144
Question: 13
Guess the total money Kiran will pay to the junk collectors. Will it be
– More than 600?
– 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, the total cost of all the junk = Rs 666
So, Kiran pays more than Rs 600.
NCERT book Page No: 64-66
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 – 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 × 63
= Rs 126
Therefore, Kiran earns Rs 126 for 63 kg of plastic.
This can be calculated as follows:
| 60 | 3 | |
| 2 | 60 × 2 | 3 × 2 |
| 120 | 6 |
By adding the digits in the 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 × 32
= Rs 448
This can be calculated as follows:
| 30 | 2 | |
| 10 | 30 × 10 | 2 × 10 |
| 300 | 20 | |
| 4 | 30 × 4 | 2 × 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 – Rs 12
= Rs 2
Hence, money earned by her by selling 32 kg of iron = Rs 2 × 32
= Rs 64
This can be calculated as follows:
| 30 | 2 | |
| 2 | 30 × 2 | 2 × 2 |
| 60 | 4 |
By adding the numbers in the 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 – Purchasing price of newspaper
= Rs 6 – Rs 5
= Rs 1
Money earned by her by selling 152 kg of newspaper = Rs 1 × 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 Dinu’s price list, the cost of 1 kg of brass = Rs 180
For 4 kg of brass, Dinu will pay = Rs 180 × 4
= Rs 720
This can also be calculated as follows:
| 100 | 80 | |
| 4 | 100 × 4 | 80 × 4 |
| 400 | 320 |
We get the desired result by adding the digits in the 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 × 18 =
(b) 45 × 24 =
(c) 69 × 52 =
(d) 77 × 55 =
(e) 142 × 5 =
(f) 382 × 3 =
(g) 2 × 175 =
(h) 4 × 206 =
Answer:
(a) Here, the number will be near 40 × 20, i.e., about 800.
Calculation:
| 30 | 7 | |
| 10 | 30 × 10 | 7 × 10 |
| 300 | 70 | |
| 8 | 30 × 8 | 7 × 8 |
| 240 | 56 |
Now, add the digits in the third and fifth rows, and we get
300 + 70 + 240 + 56 = 666
Therefore, 37 × 18 = 666
(b) 45 × 24
This number will be near 40 × 25 = 1000
Calculation:
| 40 | 5 | |
| 20 | 40 × 20 | 5 × 20 |
| 800 | 100 | |
| 4 | 40 × 4 | 5 × 4 |
| 160 | 20 |
Add the digits in the third and fifth rows, and we get
800 + 100 + 160 + 20 = 1080
Hence, 45 × 24 = 1080
(c) 69 × 52
Here, the number will be near 70 × 50 = 3500
Calculation:
| 60 | 9 | |
| 50 | 60 × 50 | 9 × 50 |
| 3000 | 450 | |
| 2 | 60 × 2 | 9 × 2 |
| 120 | 18 |
On adding the digits in the third and fifth rows, we get
3000 + 450 + 120 + 18 = 3588
Hence, 69 × 52 = 3588
(d) By guessing 77 × 55
The number will be near 80 × 50 = 4000
Calculation:
| 70 | 7 | |
| 50 | 70 × 50 | 7 × 50 |
| 3500 | 350 | |
| 5 | 70 × 5 | 7 × 5 |
| 350 | 35 |
On adding the numbers in the third and fifth rows, we get
3500 + 350 + 350 + 35 = 4235
Therefore, 77 × 35 = 4235
(e) On guessing 142 × 5
The number will be near 140 × 5 = 700
Calculation:
| 100 | 40 | 2 | |
| 5 | 100 × 5 | 40 × 5 | 2 × 5 |
| 500 | 200 | 10 |
By adding the numbers in the last row, we get
500 + 200 + 10 = 710
Therefore, 142 × 5 = 710
(f) 382 × 3
The number will be near 380 × 3 = 1140 on guessing.
Calculation:
| 300 | 80 | 2 | |
| 3 | 300 × 3 | 80 × 3 | 2 × 3 |
| 900 | 240 | 6 |
On adding the digits in the last row, we will get
900 + 240 + 6 = 1146
So, 382 × 3 = 1146
(g) 2 × 175
On guessing this number will be near 2 × 175 = 350
Calculation:
| 100 | 70 | 5 | |
| 2 | 100 × 2 | 70 × 2 | 5 × 2 |
| 200 | 140 | 10 |
On adding the digits in the last row, we get
200 + 140 + 10 = 350
(h) 4 × 206
This number will be near 5 × 200 = 1000 on guessing.
Calculation:
| 200 | 6 | |
| 4 | 200 × 4 | 6 × 4 |
| 800 | 24 |
On adding the digits in the last row, we get
800 + 24 = 824
Therefore, 4 × 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 × 5 = Rs 500 Rs 50 × 1 = Rs 50 Rs 20 × 9 = Rs 180 Rs 10 × 18 = Rs 180 Rs 5 × 28 = Rs 140 Total money she got from Dinu = Rs 1050 Rs 1050 – Rs 919 ___________ Total money she earned = Rs 131 = Rs 131 ___________ |
NCERT Class 4 Maths Chapter 6 covers the topic of The junk seller. The chapter-wise syllabus helps to revise the concepts at students’ own speed and practise to perfection. NCERT publishes textbooks prescribed by the Central Board of Secondary Education (CBSE). BYJU’S offers a platform for students with all the study materials, such as textbooks, notes, question papers, etc.
To provide good practice and a detailed understanding of each concept, CBSE Class 4 Maths Worksheets are also provided here that give a thorough insight into concepts explained in the chapter, 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 the chapter, The junk seller and clear the doubts with the help of solved examples.
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