The Junk Seller Class 4 Math JKBOSE Solutions

“The Junk Seller” is Chapter 6 from Merry Math IV for students of Class 4th of JKBOSE. This particular post is about The Junk Seller Class 4 Math JKBOSE Solutions. In a previous post, you read about The Way the World Looks Class 4 Math JKBOSE Solutions. Let’s get started:

The Junk Seller Class 4 Math JKBOSE Solutions

Page No. 75 Solutions

What about you? Do you also find Maths difficult?

Ans. No, I don’t find Maths difficult.

What is the most difficult thing in your Maths book?

Ans. The Lesson ‘Halves and Quarter’ is the most difficult thing in this Maths book.

What do you think is the easiest lesson?

Ans. “Tick-Tick-Tick’ is the easiest lesson.

Page No. 76 Solutions

Find out: how much for a cup of tea?

Ask people and find out the cost of a cup of tea.

at a tea stall

at a hotel ……..

Ans. At a tea stall, the cost of a cup of tea is Rs. 10

At a hotel, the cost of a cup of tea is Rs. 30

If a person who runs a tea stall earns 30 in a day.

(a) How much will he earn in 10 days? 

Ans. One-day earning = ₹ 30

10 days earning = 30 × 10 = ₹ 300.

(b) And in a month? 

Ans. (One month = 30 days)

One-day income = ₹ 30

30 days income = 30 x 30 = ₹ 9000

How did you get the answer? Discuss.

Ans. I got the answer by multiplying 1 day’s earnings by number of days.

Page No. 77 Solutions

Find out: what is a loan?

Have you ever heard of someone taking a loan? For what?

Ans. Yes, I have heard of someone taking a loan. It is taken to buy a house or a car or a shop.

Hariya and Babu want to buy a handcart for ₹ 300

Hariya took a loan of ₹ 300 from a bank for six months. He had to pay ₹ 51 every month to the bank.

Babu took a loan of ₹ 300 from Chunnilal. After six months he paid back ₹ 360.

How much loan was taken? 

Ans. 300 was taken as loan.

How much money was paid back?

Ans. In the case of Hariya:

Hariya took a loan of 300 from a bank and paid 51 every month.

So he paid back to the bank in 6 months = 51 × 6 = ₹ 306

In case of Babu

Babu paid back to Chunnilal ₹ 360.

Who has to pay back more Hariya or Babu?

Ans. Babu has to pay back more.

Page No. 79 Solutions

I have 9 rickshaws of my own. I give the rickshaws on rent, each for ₹ 20 a day. On Sundays, I do not take any money for them.

How much does Kiran earn from 9 Rickshaws in a Day?

Ans. For 1 rickshaw she gets 20 per day.

So, for 9 rickshaws she will earn ₹ 20 × 9 = ₹ 180

How did you do it?

Ans. By multiplying 20 × 9, I did it.

Page No. 80 Solutions

In a week how much does Kiran earn from one rickshaw?

Ans. On Sunday she does not take any money from them.

Therefore,

In one day, she earns ₹ 20 per rickshaw

In 6 days, she will earn ₹ 20 × 6 = ₹ 120 Ans.

Do it mentally and write the answers.

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?

How much will Kiran pay for a 31 kg newspaper?

Sol. Cost of 1 kg newspaper = ₹ 5

Cost of 31 kg newspaper = ₹ 31 × 5 =₹ 155 Ans.

Page No. 81 Solutions

How much will Kiran pay for 42 kg of newspapers?

Sol. Cost of 1 kg newspaper = ₹ 5

Cost of 42 kg newspaper = ₹ 42 × 5 = ₹ 210 Ans.

Also, find the cost of:

(A) 22 kg of plastic

(B) 23 kg of waste paper

(C) 12 kg of iron

Sol. Cost Price of 1 kg plastic= ₹10

Selling Price of 1 kg Plastic = ₹ 12

Profit on Selling 1 kg Plastic =12 – 10 = ₹ 2

(A) Cost of 1 kg plastic = ₹ 10

Cost of 22 kg plastic = ₹ 22 × 10 = ₹ 220 Ans.

(B) Cost of 1 kg waste paper =₹ 4

Cost of 23 kg waste paper = ₹ 23 × 4 = ₹ 92 Ans.

(C) Cost of 1 kg iron = ₹ 12

Cost of 12 kg iron = 12 x 12 = ₹ 144 Ans.

Page No. 82 Solutions

The rate of 1 kg of plastic is ₹ 12.

So, the cost of 63 kg of plastic will be ₹12 × 63 = ₹ 756

So, for 63 kg of plastic, Dinu will give ₹ 756.

Kiran bought 1 kg of plastic for ` 10, but sold 1 kg plastic for ` 12. How much money does she earn on selling 1 kg plastic? ` __________

So, how much money does she earn for 63 kg? ` _________

Ans. Cost Price of 1 kg plastic=10

Selling Price of 1 kg Plastic = 12

Profit on Selling 1 kg Plastic =12-10 = 2

In Second Case

Earning on Selling 1 kg plastic = 2

Earning on Selling 63 kg plastic = 2 × 63

On adding the numbers = 120 + 6 = 126

So, she earns 126 Ans.

Page No. 83 Solutions

Kiran sells 32 kg iron. How much money will Dinu pay for 32 kg iron?

Ans. The rate of 1 kg iron = 14

The rate of 32 kg iron = 14 × 32

We write as

Adding the numbers in the boxes: 300 + 120 +20 + 8 = 448

So, Dinu will pay 448 for 32 kg of iron.

Kiran buys 1 kg iron for 12 but sells it for 14. How much does she earn when she sells 32 kg of iron? 

Sol. Cost of 1 kg iron = 12

Selling price of 1 kg iron = 14

Earning on Selling 1 kg iron =14 – 12 = 2

In the second case,

After selling 32 kg iron, she earns………

Earning on selling 1 kg iron = 2

Earning on selling 32 kg iron = 2 × 32

We write as

What does Dinu pay for brass? How much money will Dinu pay for 4 kg brass?

Ans. Dinu pays 180 for 1 kg of brass.

Cost of 1 kg brass = 180

Cost of 4 kg brass = 180 × 4

We write as

Adding the numbers in the boxes: 400+320 = 720

So, for 4 kg brass Dinu will pay 720

Page No. 84-86 Solutions

First, guess the answer and then calculate.

(a) 37 x 18 =

We write as

Adding the numbers in the boxes: 300+240 + 70+ 56 = 666 Ans.

So, 37 x 18 = 666

(b) 45 × 24 =

We write as

Adding the numbers in the boxes: 800 + 160 +100+20= 1080

So, 45 × 24= 1080 Ans.

(c) 69 x 52=

We write as

Adding the numbers in the boxes: 3000+ 450+ 120 +18 = 3588

So, 69 × 52 = 3588 Ans.

(d) 77 × 55 =

We write as

Adding the numbers in the boxes: 3500 +350 +350 +35 = 4235

So, 77 × 55 = 4235 Ans.

(e) 142 x 5 =

We write as

Adding the numbers in the boxes: 500 + 200 + 10 = 710

So, 142 x 5 = 710 Ans.

(f) 382 × 3 =

We write as

Adding the numbers in the boxes: 900+240 + 6 = 1146

So, 382 × 3 = 1146 Ans.

(g) 2 × 175 =

We write as

Adding the numbers in the boxes:200+ 140 + 10 = 350

So, 2 x 175 = 350 Ans.

(h) 4 × 206 =

We write as

Adding the numbers in the boxes: 800+ 24 = 824

So, 4 × 206 = 824 Ans.

Kiran paid 919 to the junk collectors. When she sold the junk she got these notes and coins from Dinu.

Now make a record in her Diary

Find out how much she earned this time.

Sol. 18 March, 2009

The money, she paid = 919

Money, she got = 500 + 50 +180 + 180 + 28 =   938

Total money she got = 938

The money, she paid = 919

The money she earned = ₹ 19

Page No. 87 Solutions

Let’s Try These- [Activity]:

1. Find the products:

(a) 400 x 4
(b) 2040 × 2
(c) 3001 x 3
(d) 1024 x 30
(e) 1413 × 90
(f) 1848 × 70
(g) 15 × 200
(h) 67 × 300
(i) 84 × 600

Sol. (a) 400 x 4 = 1600 Ans.

(b) 2040 x 2 =

We write as:

Adding the numbers in the boxes: 4000+80 = 4080

So, 2040 x 2 = 4080 Ans.

(c) 3001 x 3 =

We write as

Adding the numbers in the boxes: 9003 + 3 = 9003

So, 3001 × 3 = 9003 Ans.

(d) 1024 × 30 =

We write as

Adding the numbers in the boxes: 30000+ 600+ 120 = 30720

So, 1024 × 30 = 30720 Ans.

(e) 1413 × 90 =

We write as

Adding the numbers in the boxes: 90000+36000+ 900 +270=127170

So, 1413 × 90 = 127170 Ans.

(f) 1848 × 70 =

We write as

Adding the numbers in the boxes: 70000 + 56000 + 2800 + 560 =129360

So, 1848 × 70 = 129360 Ans.

(g) 15 x 200 =

We write as

Adding the numbers in the boxes: 2000 + 1000 = 3000

So, 15 × 200 = 3000 Ans.

(h) 67 × 300 =

We write as

Adding the numbers in the boxes: 18000 + 2100 = 20100

So, 67 × 300 = 20100 Ans.

(i) 84 × 600 =

We write as

Adding the numbers in the boxes: 48000 + 2400 = 50400

So, 84 × 600 = 50400 Ans.

2. Find the products:
(a) 24 x 234
(b) 91 x 347
(c) 88 x 567
(d) 148 x 456
(e) 474 × 168
(f) 364 × 272
(g) 113 x 405
(h) 371 × 501

Ans. (a) 24 × 234 =

We write as

Adding the numbers in the boxes: 4000+ 600+80+ 800 + 120 +16= 5616

So, 24 × 234 = 5616 Ans.

(b) 91 × 347 =

We write as

Adding the numbers in the boxes: 27000 + 3600 + 630 + 300 +40 + 7 = 31577

So, 91 x 347 = 31577 Ans.

(c) 88 x 567 =

We write as

Adding the numbers in the boxes:

40000 + 4800 + 560 + 4000+ 480 + 56 = 5649896

So, 88 ×567 = 49896 Ans.

(d) 148 × 456 =

We write as

Adding the numbers in the boxes: 40000 + 5000 + 600+ 16000+ 2000 +240 + 3200 + 400 + 48 = 67488

So, 148 × 456 = 67488 Ans.

(e) 474 × 168 =

We write as

Adding the numbers in the boxes:

40000 + 24000 + 3200 + 7000 + 4200+560+ 400+240 +32 = 79632

So, 474 × 168 = 79632 Ans.

(f) 364 × 272 = 

We write as

Adding the numbers in the boxes: 60000 + 21000 + 600 + 12000 + 4200+ 120 + 800 + 280+8=99008

So, 364 x 272 = 99008 Ans.

(g) 113 × 405 =

We write as

Adding the numbers in the boxes: 40000 +500 + 4000 + 50 + 1200 + 15 = 45765

So, 113 × 405 = 45765 Ans.

(h). 371 × 501 =

We write as

Adding the numbers in the boxes: 150000 + 300 + 35000+ 70 + 500 + 1 = 185871

So, 371 × 501 = 185871 Ans.

3. A farmer plants 125 banana trees in a row. How many banana trees are required for a plantation in 23 rows?

Ans. Number of banana plants in one row = 125

Number of banana plants in 23 rows = 23 × 125

We write as

We add numbers in the boxes: 2000 + 400 + 100 + 300 +60 + 15 = 2875

So, the number of banana trees required for a plantation in 23 rows = 2875 Ans.

4. A library has 215 racks of books. If each rack holds 205 books, how many books does the library have? 

Ans. Number of books in each rack = 205

Number of books in 215 racks = 205 × 215

We write as

We add the numbers in the boxes: 40000+ 2000+ 1000 + 1000 + 50 + 25= 44075

So, the library has 44075 books. Ans.

5. A woman saves 260 every month. How much money will she save in 5 years?

Ans. Number of months in 5 years = 5 x 12 = 60

Money saved every month = 260

Money saved in 60 months = 60 × 260

We write as

We add the numbers in the boxes: 12000 + 3600 = 15600

So, the woman saves 15600 in 5 years. Ans.

6. A cycle costs 575. How much will 150 cycles cost?

Ans. Cost of one cycle = 575

Cost of 150 cycles = 150 × 575

We write as

We add the numbers in the boxes: 50000 + 7000 + 500 + 25000 + 3500 +250 = 86250

So, Cost of 150 cycles = 86250. Ans.

7. How many minutes are there in the month of January?

(Hint 31 x 24 × 60)

Ans. Number of days in the month of January = 31

Number of hours in the month of January = 24 × 31

We write as

We add the numbers in the boxes:

600 + 20 + 120 + 4 = 744

Number of minutes in 1 hour = 60

Number of minutes in 744 hours = 60 × 744

We write as

We add the numbers in the boxes:

42000 + 2400 + 240 = 44640

So, there are 44640 minutes in the January Ans.

8. A man has 615 notes of 50- rupees denomination. How much money did he have? 

Sol. Money he had = 50 × 615

We write as

We add the numbers in the boxes: 30000+500 + 250 = 30750

The man has 30750 Ans.

That’s it about The Junk Seller Class 4 Math JKBOSE Solutions. Hope you found it useful. Do share your views about this post in the comment section below.