Knowing Our Numbers
Page 12
Try These
1). How many centimetres make a kilometre?
Ans: 100000 centimetres make a kilometer.
2). Name five large cities in India. Find their population. Also, find the distance in kilometres between these cities.
The five largest cities in India and their population (approximately) is as follows:
1). Mumbai – 12 million
2). Delhi – 11 million
3). Bengalooru – 8 million
4). Hyderabad – 6 million
5). Ahmadabad – 5 millions
Page 13
1). How many milligrams make one kilogram?
Ans: 1 kilogram= 1000 grams
1gram = 1000 milligrams
Therefore, 1 kilogram = 1000 X 1000
= 1000000
1000000 milligrams make one kilogram.
2). A box contains 2,00,000 medicine tablets each weighing 20mg. What is the total weight of all the tablets in the box in grams and in kilograms?
Weight of each tablet = 20 mg
Total number of tablets in the box = 200000
Weight of all the tablets = 200000 X 20 = 4000000 mg
(1 gram = 1000 mg)
Therefore, 4000000 mg = 4000000 ÷ 1000
= 4000 grams
(1 kg = 1000 g)
Therefore 4000 g = 4000 ÷ 1000
= 4 kg
Try these
1). A bus started and reached different places with a speed of 60 km/hour. The journey is shown on page 14.
i). Find the total distance covered by the bus from A to D.
Total distance covered by the bus from A to D = distance from A to B + distance from B to C + distance from C to D
= 4170 + 3410 + 2160
= 9740 km
ii). Find the total distance covered by the bus from D to G.
Total distance covered by the bus from D to G = distance from D to E + distance from E to F + distance from F to G
= 8140 + 4830 + 2550
= 15520 km
iii). Find the total distance covered by the bus, if it starts from A and returns back to A?
The total distance covered by the bus, if it starts from A and returns back to A
= 4170 + 3410 + 2160 + 8140 + 4830 + 2550 + 1290
= 26550 km
iv). Can you find the difference of distances form C to D and D to E?
Page 14
2). Find the time taken by bus to reach
a). A to B
speed of the bus = 60 km per hour
distance from A to B = 4170 km
time taken = distance travelled /speed of the bus
= 69 hours 30 min
b). C to D
speed of the bus = 60 km per hour
distance from C to D = 2160 km
time taken = distance travelled /speed of the bus
= 36 hours
c). E to G
speed of the bus = 60 km per hour
distance from E to G = 4830 + 2550 = 7380 km
time taken = distance traveled/speed of the bus
= 123 hours
d). Total journey.
speed of the bus = 60 km per hour
distance from C to D = 26550 km
time taken = distance travelled /speed of the bus
= 36 hours
2). Raman’s shop
| Things | Price | The sales during the last year |
| Apples | Rs 40 per kg | 2457 kg |
| Oranges | Rs 30 per kg | 3004 kg |
| Combs | Rs 3 per one | 22760 |
| Toothbrushes | Rs 10 per one | 25367 |
| Pencils | Rs 1 per one | 38530 |
| Notebooks | Rs 6 per one | 40002 |
| Soap cakes | Rs 8 per one | 20005 |
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 = 2457 + 3004
= 5461 kg
Answer: The total weight of apples and oranges = 5461kg
b). Can you find the total money Raman got by selling apples?
Weight of apples = 2457 kg
Cost of apples = Rs 40 per kg
Money obtained by selling apples = 2457 X 40
= 98280
c). Can you find the total money Raman got by selling apples and oranges together?
Weight of apples = 2457 kg
Cost of apples = Rs 40 per kg
Money obtained by selling apples = 2457 X 40
= 98280
Weight of oranges = 3004 kg
Cost of oranges = Rs 30 per kg
Money obtained by selling oranges = 3004 X 30
= 90120
Total money obtained by selling apples and oranges
= 98280 + 90120
= 188400
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?
Money received for each item in descending order is as follows:
| Things | Price | The sales during the last year | Total amount received |
| Toothbrushes | Rs 10 per one | 25367 | Rs 253670 |
| Notebooks | Rs 6 per one | 40002 | Rs 240012 |
| Soap cakes | Rs 8 per one | 20005 | Rs 160040 |
| Apples | Rs 40 per kg | 2457 kg | Rs 98280 |
| Oranges | Rs 30 per kg | 3004 kg | Rs 90120 |
| Combs | Rs 3 per one | 22760 | Rs 68280 |
| Pencils | Rs 1 per one | 38530 | Rs 38530 |
Toothbrushes have bought more amount of money for Raman. The amount of money received by selling toothbrushes is Rs 2,53,670.
Knowing Our Numbers
