Secondary School (English Medium) (5 to 8) कक्षा ५ - CBSE Question Bank Solutions for Mathematics

Chumki, Jhumri, and Imran need wire to make a fence.

• Who will need the longest wire for fencing?

Chumki, Jhumri, and Imran need wire to make a fence.

• How much wire in all will the three need?

Look at the table. If you were to write the area of each of these which column would you choose? Make a (✓).

There are two beautiful lakes near a village. People come for boating and picnics in both the lakes. The village Panchayat is worried that with the noise of the boats the birds will stop coming. The Panchayat wants motorboats in only one lake. The other lake will be saved for the birds to make their nests.

• How many cm is the length of the boundary of lake A in the drawing?(use thread to find out)

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?

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.

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.

So Anar also tried many different ways to make a boundary for 800 square meters of land.

He made rectangles A, B, and C of different sizes. Find out the length of the boundary of each. How much gold wire will he get for these rectangles?

• A 
  Gold wire for A = _________ metres
• B 
  Gold wire for B = _________ metres
• C  
  Gold wire for C = __________ metres

But then Anar made an even longer rectangle... See how long!

• D 
  So he will get __________ metres of gold wire!!

Can you make a rectangle with a still longer boundary? I made a rectangle 1 cm wide and 80000 m long. Imagine how long that boundary will be!!! With that much gold wire I can become a king!

Karunya bought three fields.

Find the area of all three fields.

• Field (A) ____________ square metre.
• Field (B) ____________ square metre.
• Field (C) ____________ square metre.

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.
  

  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?

  Explain why (a) and (c) are not good choices.

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?

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?

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?

How do people who cannot see make out different notes and coins? (Hint: Look for a shape etc. on notes of Rs 20, 50, 100, 500 etc. and feel it.)

What should we look for to check if a 100-rupee note is real or fake?

Measure the length of the floor of your classroom in meters. Also measure the width.

• If you want to move around easily then how many children do you think should be there in one square meter?

There are two beautiful lakes near a village. People come for boating and picnics in both the lakes. The village Panchayat is worried that with the noise of the boats the birds will stop coming. The Panchayat wants motorboats in only one lake. The other lake will be saved for the birds to make their nests.

• What is the length of the boundary of lake B in the drawing?

There are two beautiful lakes near a village. People come for boating and picnics in both the lakes. The village Panchayat is worried that with the noise of the boats the birds will stop coming. The Panchayat wants motorboats in only one lake. The other lake will be saved for the birds to make their nests.

• How many kilometers long is the actual boundary of lake A?

There are two beautiful lakes near a village. People come for boating and picnics in both the lakes. The village Panchayat is worried that with the noise of the boats the birds will stop coming. The Panchayat wants motorboats in only one lake. The other lake will be saved for the birds to make their nests.

• How many kilometers long is the actual boundary of lake B?