CBSE Class 4 Mathematics NCERT Solutions: Unit 6 - The Junk Seller

This is a personal question. Some students might find Maths challenging, while others may not. The key to finding Maths easy is regular practice and understanding the concepts thoroughly. Consistent effort can make even difficult topics manageable.

Similar to the previous question, the perception of difficulty varies among students. Many find that with regular practice and clear explanations, no topic in the Maths book is inherently difficult. Understanding the underlying principles makes all lessons seem manageable.

The easiest lesson is subjective and depends on individual understanding and practice. For many students, lessons that involve simple arithmetic operations and have clear, relatable examples might seem the easiest. However, consistent practice is crucial for mastering any lesson.

To find the cost of a cup of tea at a tea stall, you would typically ask the vendor or observe the price list. Based on common knowledge, the price can vary, but a typical cost at a local tea stall is often around Rs 3 to Rs 5.

Answer: At a tea stall, a cup of tea usually costs Rs 3.

The cost of a cup of tea at a hotel is generally higher than at a tea stall due to the service and ambiance provided. Hotels often charge more for beverages compared to smaller, local establishments.

Answer: At a hotel, a cup of tea typically costs Rs 5.

To calculate the total earnings over a period, we multiply the daily earning by the number of days.

Earning in 1 day = Rs 30

Earning in 10 days = Earning per day × Number of days

$$=\; \backslash text\{Rs\; \}\; 30\; \backslash times\; 10$$

$$=\; \backslash text\{Rs\; \}\; 300$$

To calculate the earning in a month, we assume a month has 30 days (a common convention for such problems).

Earning in 30 days = Earning per day × Number of days in a month

$$=\; \backslash text\{Rs\; \}\; 30\; \backslash times\; 30$$

$$=\; \backslash text\{Rs\; \}\; 900$$

Answer: In 10 days, the person will earn Rs 300. In a month (30 days), the person will earn Rs 900.

A loan is an amount of money that is borrowed from a person or institution, which needs to be paid back, usually with interest, over a period of time. People often take loans to start a business, buy a house, purchase a vehicle, or for other significant expenses.

Answer: Yes, I have heard of someone taking a loan. He took a loan to start his shop.

The question refers to a specific instance mentioned previously or in context. Based on the provided information, the loan amount taken was a specific sum that needs to be repaid.

Answer: He took Rs 10,000 as a loan.

The amount paid back includes the original loan amount plus any interest charged. This is the total sum returned to the lender after a certain period.

Answer: He paid back Rs 11,000 after one year.

We need to calculate the total amount paid by both Hariya and Babu to compare who paid more.

Hariya's payment: Hariya has to pay Rs 51 every month for six months.

Total paid by Hariya = Monthly payment × Number of months

$$=\; \backslash text\{Rs\; \}\; 51\; \backslash times\; 6$$

$$=\; \backslash text\{Rs\; \}\; 306$$

Babu's payment: Babu has to pay Rs 360.

Comparing the amounts: Rs 306 (Hariya) vs Rs 360 (Babu).

Since Rs 360 is greater than Rs 306, Babu has to pay back more money.

Answer: Babu will have to pay back more money.

Kiran earns a certain amount for each rickshaw she rents out. To find her total earnings from multiple rickshaws, we multiply the earning per rickshaw by the number of rickshaws.

Earning from 1 rickshaw = Rs 20

Earning from 9 rickshaws = Earning per rickshaw × Number of rickshaws

$$=\; \backslash text\{Rs\; \}\; 20\; \backslash times\; 9$$

$$=\; \backslash text\{Rs\; \}\; 180$$

This calculation shows that she earns 9 times the amount she earns from one rickshaw.

Answer: Kiran earns Rs 180 from 9 rickshaws in a day.

This question uses a slightly different approach to find the earnings for 9 rickshaws, starting from the earnings for 10 rickshaws. If Kiran earns Rs 200 for 10 rickshaws, the earnings for 9 rickshaws would be Rs 200 minus the earning from one rickshaw.

Earning from 10 rickshaws = Rs 200

Earning from 1 rickshaw = Rs 20

Earning from 9 rickshaws = Earning from 10 rickshaws - Earning from 1 rickshaw

$$=\; \backslash text\{Rs\; \}\; 200\; -\; \backslash text\{Rs\; \}\; 20$$

$$=\; \backslash text\{Rs\; \}\; 180$$

Answer: So, for 9 rickshaws, she will get Rs 200 – 20 = 180.

To find Kiran's earnings from one rickshaw in a week, we need to multiply her daily earning from one rickshaw by the number of days in a week.

Earning from one rickshaw in 1 day = Rs 20

Number of days in a week = 7

Earning from one rickshaw in 7 days = Earning per day × Number of days

$$=\; \backslash text\{Rs\; \}\; 20\; \backslash times\; 7$$

$$=\; \backslash text\{Rs\; \}\; 140$$

Answer: In a week, Kiran earns Rs 140 from one rickshaw.

These are mental math problems involving multiplication. Let's solve each one:

2 × 6 = 12

4 × 80 = 320

20 × 6 = 120

4 × 81 = 324

2 × 60 = 120

9 × 25 = 225

3 × 42 = 126

31 × 9 = 279

Answers:

$$2\; \backslash times\; 6\; =\; 12$$

$$4\; \backslash times\; 80\; =\; 320$$

$$20\; \backslash times\; 6\; =\; 120$$

$$4\; \backslash times\; 81\; =\; 324$$

$$2\; \backslash times\; 60\; =\; 120$$

$$9\; \backslash times\; 25\; =\; 225$$

$$3\; \backslash times\; 42\; =\; 126$$

$$31\; \backslash times\; 9\; =\; 279$$

To find the total cost of the newspaper, we need to know the price per kilogram and the total weight of the newspaper. The problem states the cost of 1 kg of newspaper and asks for the cost of 31 kg.

Cost of 1 kg of newspaper = Rs 5

Total weight of newspaper = 31 kg

Total cost = Cost per kg × Total weight

$$=\; \backslash text\{Rs\; \}\; 5\; \backslash times\; 31$$

$$=\; \backslash text\{Rs\; \}\; 155$$

Answer: Kiran will pay Rs 155 for 31 kg of newspaper.