NCERT class 5 Math Magic chapter 2 solutions

Posted onAuthorRishabh Sankhla

NCERT class 5 Math Magic chapter 2 solutions

 

MATH – MAGIC

Book 5

Textbook in Mathematics for Class V

 

Lesson 2. Shapes and Angles

Practice time: –   (Page 18-19)

  1. The angle marked in black colour is the biggest angle.
  2. Are the angles marked with yellow equal? _____
  3. Are the angles marked with green equal? _____
  4. Are the angles marked with blue equal? ______
  5. Four different angles are marked in four colours. Can you find other angles which are the same as the one marked in red? Mark them in red. Do this for other colorus.
  6. How many different shapes can you make by changing the angle between the matchsticks in each of these? Try.

 

 

 

 

Find out    (Page 7)

Look at the sun and find out the direction from where it rises.

  1. From where you are, what interesting thing do you see to your east?
  2. Name two things that are lying to your west?

 

Which boat gets how much?      (Page 9)

In one trip the log boat brings about 20 kg of fish. But other types of boats bring a bigger catch as given in the table. The table also shows the speed of each type of boat, which is how far each boat goes in one hour. Look at the table and calculate –

  1. About how much fish in all will each types of boat brings in seven trips?

Ans = Log boat = 140 kg, Long tail boat = 4,200 kg,

Motor boat = 5,600 kg, Machine boat = 42,000 kg.

 

  1. About how far can a motor boat go in six hours?

Ans = 120 km.

 

  1. If a long tail boat has to travel 60 km how long will it take?

Ans = 5 hour

 

Type of boat Cath of fish in one trip (in kg) Speed of boat (how far it goes in one hour)
Log boat 20 4 km per hour
Long tail boat 600 12 km per hour
Motor boat 800 20 km per hour
Machine boat 6000 22 km per hour

 

Practice time      (Page 11-12)

  1. At what price per kg did Fazila sell the kingfish?

Ans = ₹ 150 per kg.

  1. Floramma has sold 10 kg prawns toady. How much money did she get for that?

Ans = ₹ 1500.

  1. Gracy sold 6 kg sword fish. Mini has earned as much money as Gracy. How many kg of sardines did Mini sell?

Ans = 9 kg.

  1. Basheer has ₹ 100. He spends one-fourth of the money on squid and another three-fourth on prawns.
  2. How many kilograms of squid did he buy?

Ans = half kilograms.

  1. How many kilograms of prawns did he buy?

Ans = half kilograms.

 

 

Women’s ‘Meenkar Bank’    (Page 12)

The meeting of the Meenkar Bank has just begun. Fazila is the president. Twenty fisherwomen have made their own bank. Each saves ₹ 25 every month and puts it in the bank.

  1. How much money does the group collect each month?

Ans = ₹ 625.

  1. How much money will be collected in ten years?

Ans = ₹ 6,250.

 

Practice time      (Page 12-13)

  1. Gracy took a loan of ₹ 4000 to buy a net. She paid back ₹ 345 every month for one year. How much money did she pay back to the bank?

Ans = ₹ 4,140.

  1. Jhansi and her sister took a loan of ₹ 21,000 to buy a log boat. They paid back a total of ₹ 23,520 in one year. How much did they pay back every month?

Ans = ₹ 1,960 per month.

 

Questions: –       (Page 14)

Item Price of each Number of items Cost
Bore well for fresh water ₹ 3000 1 ₹ 3000
Bamboo rack for fish drying ₹ 2000 20 ₹ 40,000
Cement tank ₹ 1000 4 ₹ 4,000
Tray and knife ₹ 300 20 ₹ 6,000
Bucket ₹ 75 20 ₹ 1,500

 

Total cost to set up the factory = _₹ 54,500_

When fresh fish is dried it becomes 1/3 its weight.

In one month, they plan to dry 6000 kg of fresh fish.

How much dried fish will they get in a month? _2000 kg_

 

Floramma – let us first calculate for 6 kg of fresh fish.

We buy fresh fish for ₹ 15 per kg
We sell dried fish for ₹ 70 per kg

 

We dry 6 kg fresh fish to get _2_ kg dried fish

For 6 kg fresh fish we have to pay        6 * _15_ = ₹ 90

We will sell 2 kg dried fish and get       2 * _70_ = ₹ 140

So, if we dry 6 kg fresh fish we will earn _140_ – 90 = ₹ 50.

But if we dry 6000 kg, we can earn ₹ _420_ * 1000 in one month!

 

(Page 15)

Jhansi – I found that for 6000 kg fish we would need 1500 kg salt every month! Its price is ₹ 2 per kg.

Monthly costs:

  1. Salt 1500 * 2 = ₹ _3000_
  2. Packing and bus charges = ₹ 3000

So the total monthly cost of drying and selling the fish = ₹ 6,000