# Chapter 1: Knowing your numbers (Intext Solutions-2)Posted on : 05-09-2018 Posted by : Admin

This article contains solutions to Intext questions from Page 12 to 25

Page 12

1. How many centimeters make a kilometer?

Answer: 1 Kilometers = 1000 meters = 1, 00, 000 centimeters

2. Name five large cities in India. Find their population. Also, find the distance in kilometers between each pair of these cities.

City Population
Kolkata 4.49 million
Mumbai 18.41 million
Delhi 18.98 million

Kolkata to Delhi: 1504 km

Mumbai to Kolkata: 1, 955 km

Delhi to Hyderabad: 1, 577 km

Page 13

1. How many milligrams make one kilogram?

Answer: 1 Kilograms = 1000 grams = 1, 00, 000 centigrams = 10, 00, 000 milligrams

2. A box contains 2, 00, 000 medicine tablets each weighing 20 mg. What is the total weight of all the tablets in the box in grams and in kilograms?

Answer: Total weight of the tablets in the box,

2, 00, 000 × 20 mg = 4, 000, 000 mg

4, 000, 000 mg = 4, 000 gm

4, 000 gm = 4 kg

1. A bus started its journey and reached different places with a speed of 60 km/hour. The journey is shown below.

(i) Find the total distance covered by the bus from A to D.

Answer: 4170 + 3410 + 2160 = 9,740 Kilometers

(ii) Find the total distance covered by the bus from D to G.

Answer: 8140 + 4830 + 2550 = 15,520 Kilometers

(iii) Find the total distance covered by the bus, if it starts from A and returns back to A.

Answer: 4170 + 3410 + 2160 + 8140 + 4830 + 2550 + 1290 = 26,550 Kilometers

(iv) Can you find the difference of distances from C to D and D to E?

Answer: (C to D) 2160 km – 8140 km (D to E) = 5,980 kilometers

(V) Find out the time taken by the bus to reach

Answer: The speed of bus is 60 km per hour, the time taken by bus for different destinations is equal to distance travelled by bus in km divided by speed of bus per hour.

A to B =

C to D =

E to G =

Total journey =

2. Raman’s shop

(a) Can you find the total weight of apples and oranges Raman sold last year?

Weight of apples = 2457 kg

Weight of oranges = 3004 kg

Therefore, total weight of oranges and apples is 2457 kg + 3004 kg =5461 kg

(b) Can you find the total money Raman got by selling apples?

The price of apples per kg is Rs 40. Raman sold total 2457 kg of apples.

Therefore, total money Raman got by selling apples = 2457 × 40 = Rs 98,280

(c) Can you find the total money Raman got by selling apples and oranges together?

The money Raman got by selling apples = 2457 kg × 40 Rs. = Rs. 98,280

The money Raman got by selling oranges = 3004 kg × 30 Rs. = Rs. 90,120

Therefore, total money Raman got by selling apples and oranges together is

98,280 + 90,120 = Rs 1, 88, 400

(d) Make a table showing how much money Raman received from selling each item. Arrange the entries of amount of money received in descending order. Find the item which brought him the highest amount. How much is this amount?

Things Price (Rs.) Sales during last year Money received from selling (Rs.)
Apples 40 per kg 2457 kg 98280
Oranges 30 per kg 3007 kg 90120
Combs 3 for one 22760 68280
Tooth brushes 10 for one 25367 253670
Pencils 1 for one 38530 38530
Note books 6 for one 40002 240012
Soap cakes 8 for one 20005 160040

• 253670 (Highest)
• 240012
• 160040
• 98280
• 90120
• 68280
• 38530

Page 19

Round off these numbers to the nearest tens

• 28 → 30
• 32 → 30
• 52 → 50
• 41 →  40
• 39 → 40
• 48 → 50
• 64 → 60
• 59 → 60
• 99 → 100
• 215 → 220
• 1453 → 1450
• 2936 → 2940

Round off the given numbers to the nearest tens, hundreds and thousands.

Given number Approx. to nearest Rounded form
75847 Tens 75850
75847 Hundreds 75800
75847 Thousands 76000
75847 Ten thousands 10000

Page 22

Estimate the following products. Make five more such problems and solve them.

Numbers Rounded off values Products
87 × 313 90 × 310 27900
9 × 795 10 × 800 8000
898 × 785 900 ×790 711000
958 × 387 960 × 390 374400
456 × 895 460 × 900 414000
89 × 75 90 × 80 7200
321 × 695 320 × 700 224000
95 × 47 100 × 50 5000
125 × 563 130 × 570 74100

Page 23

Write the expressions for each of the following using brackets.

(a) Four multiplied by the sum of nine and two.

Answer: 4 × (9 + 2)

(b) Divide the difference of eighteen and six by four.

(c) Forty five divided by three times the sum of three and two.

2. Write three different situations for (5 + 8) × 6.

(One such situation is: Sohani and Reeta work for 6 days; Sohani works 5 hours a day and Reeta 8 hours a day. How many hours do both of them work in a week?)

Situation 1: Shasi and Roopa bought 5 chocolates and 8 chocolates respectively and the cost of each chocolate is Rs.6. How much money did they spend together to buy chocolates?

Situation 2: Pihu and chinku drink 5 and 8 glasses of water everyday respectively. How many glasses of water do they drink for 6 days together?

Situation 3: In an Exhibition, Priya and Riya played 5 and 8 games respectively and the cost of each game is Rs.6. How much money did they spend together to play the games?

3. Write few situations for the following where brackets would be necessary.

(a) 7(8 – 3)

Situation 1: A shopkeeper brought 8 pens for Rs. 7 each. He sold 3 pens. What is the total cost of the remaining pens?

Situation 2: A girl has 8 dolls each costing Rs 7. She gave 3 dolls to her sister. What is the cost of remaining dolls?

Situation 3: A woman brought 8 sarees for Rs. 7 each. She sold 3 sarees. What is the cost of remaining sarees?

(b) (7 + 2) (10 – 3)

Situation 1: Team A and Team B with 7 and 10 members respectively planned a picnic. Later 2 more members joined Team A and 3 members were absent from team B.

Situation 2: Number of girls in the class were 7 and number of boys were 10. Later 2 girls joined the class and 3 boys left the school.

Situation 3: Two baskets A and B have 7 oranges and 10 mangoes respectively. Mother added more 2 oranges to basket A and Ram ate 3 mangoes from basket B.

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