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Draw a square of 9 square cm. Write A on it. Draw another square with double the side. Write B on it.
Answer these —
1. The perimeter of square A is __________ cm.
2. The side of square B is __________ cm.
3. The area of square B is __________ square cm.
4. The area of square B is __________ times the area of square A.
5. The perimeter of square B is __________ cm.
6. The perimeter of square B is __________ times the perimeter of square A.
Concept: undefined >> undefined
The King was very happy with carpenters Cheggu and Anar. They had made a very big and beautiful bed for him. So as gifts the king wanted to give some land to Cheggu, and some gold to Anar. Cheggu was happy. He took 100 meters of wire and tried to make different rectangles.
He made a 10 m × 40 m rectangle. Its area was 400 square meters. So he next made a 30 m × 20 m rectangle.
- What is its area? Is it more than the first rectangle?
Concept: undefined >> undefined
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The King was very happy with carpenters Cheggu and Anar. They had made a very big and beautiful bed for him. So as gifts the king wanted to give some land to Cheggu, and some gold to Anar. Cheggu was happy. He took 100 meters of wire and tried to make different rectangles.
He made a 10 m × 40 m rectangle. Its area was 400 square meters. So he next made a 30 m × 20 m rectangle.
- What other rectangles can he make with 100 meters of wire? Discuss which of these rectangles will have the biggest area.
Concept: undefined >> undefined
Cheggu’s wife asked him to make a circle with the wire. She knew it had an area of 800 square meters.
- Why did Cheggu not choose a rectangle? Explain.
Concept: undefined >> undefined
Try yourself
- Next time when you watch your favourite TV programme, count the number of advertisements during each break. Use tally marks. Put a dot below the tally when you find children in any advertisement.
- Compare with your friends. Do you get different answers?
Concept: undefined >> undefined
Karunya bought three fields.
Find the area of all three fields.
- Field (A) ____________ square metre.
- Field (B) ____________ square metre.
- Field (C) ____________ square metre.
Concept: undefined >> undefined
Each line gives a story. You have to choose the question which makes the best story problem. The first one is already marked.
- A shopkeeper has 50 boxes. There are 48 fruits in one box.
Tick the one question which matches with the given problem.
Explain why (a) and (c) are not good choices.a) How much will the shopkeeper pay in all? b) How many fruits are there in all? ✓ c) How many more boxes will he need?
Concept: undefined >> undefined
Each line gives a story. You have to choose the question which makes the best story problem. The first one is already marked.
- 352 children from a school went on a camping trip. Each tent had a group of 4 children.
a) How many children did each tent have? b) How many tents do they need? c) How many children in all are in the school?
Concept: undefined >> undefined
Each line gives a story. You have to choose the question which makes the best story problem. The first one is already marked.
- A shopkeeper has 204 eggs. He puts them in egg trays. Each tray has 12 eggs.
a) How many more eggs will he need? b) How many fresh eggs does he sell? c) How many egg trays does he need?
Concept: undefined >> undefined
Each line gives a story. You have to choose the question which makes the best story problem. The first one is already marked.
- The cost of one book is Rs 47. Sonu buys 23 books.
a) How much money does she have? b) How much money does she pay for the books? c) What is the cost of 47 books?
Concept: undefined >> undefined
The students of Class XII are going on a trek to Gangotri. They have to pack their bags for six days and keep them light. They also have to take things that do not take too much space. So they will look for things that have both less volume and less weight. After all, they will carry their own bags while climbing the mountains!
They even dry the onions and tomatoes to make them light. One kg of onions or tomatoes becomes 100 g when the water inside dries up.
The list of food each person will need for one day:
| Rice | 100 g |
| Flour (Atta) | 100 g |
| Pulses (Dal) | `1/3` the weight of rice and flour |
| Oil | 50 g |
| Sugar | 50 g |
| Milk powder | 40 g (for tea, porridge, and hot drink) |
| Tea | Around 10 g |
| Dalia | 40 g for breakfast |
| Salt | 5 g |
| Dried onions | 10 g |
| Dried tomatoes | 10 g |
For 6 days, each person will need
- Rice and flour − __________ g
- Pulses − _________ g
- Dried onions − _________ g
Concept: undefined >> undefined
How much of fresh tomatoes should be dried for 6 days for 10 people?
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What is the total weight of food (for 6 days) in each person s bag?
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Guess how many children of your weight will be equal to the weight of an elephant of 5000 kg.
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At birth, a baby elephant weighs around 90 kg. How much did you weigh when you were born? Find out. How many times is a baby elephant heavier than you were at birth?
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If a grown-up elephant eats 136 kg of food in a day then it will eat around _________ kg in a month.
Concept: undefined >> undefined
How many coins are there in a sack of 5 rupee coins if it weighs:
- 18 kg? ______
Concept: undefined >> undefined
How many coins are there in a sack of 5 rupee coins if it weighs:
- 54 kg? ______
Concept: undefined >> undefined
How many coins are there in a sack of 5 rupee coins if it weighs:
- 4500 g? ______
Concept: undefined >> undefined
How many coins are there in a sack of 5 rupee coins if it weighs:
- 2 kg and 250 g? ______
Concept: undefined >> undefined
