The Fish Tale Class 5 Notes Maths Chapter 1

Introduction

•  Have you ever wondered what it’s like to work in the middle of the sea? Just like our parents work in offices, shops, or fields, some people work out on the water every day—fishermen! 
• Today, we’ll join a fisherman, Ravi, on his exciting day at sea. As we follow him, we’ll discover how math plays a big role in his life. From the shapes of the fish, the speed of his boat, and even how he counts his money—math is everywhere! 
•  Let’s dive in and uncover the amazing ways math and the sea are connected! 

Fishes and their Different Shapes

• When Ravi goes to the catch the fish, he sees fishes of many different shapes and kinds.
• Did you know that you can create different fishes by using geometrical shapes?
• This can be done by using different shapes such as squares and triangles.
• This shows us just how important shapes are in our lives!

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Do all Fishes have the Same Size?

• Ravi sees fishes all of different sizes everyday.
•  If a fish is too small, he lets it go so it can grow bigger.
• Did you know that the smallest fish is about 1 cm long? 
• The biggest fish is the whale shark. 
• It is actually not a whale but is a big, big fish. 
• One whale shark was as long as 18 m. Its weight is about 16000 kg! In comparison, do you know how much do you weigh?

The Fish Tail

• To understand the differences between whales and fish, pay close attention to their tails.
• The tail of a fish is flat and lies along its body.
• In contrast, the tail of a whale resembles two legs.
• Can you find the fishes in the picture?

'Schools' of Fish

• Fish like to swim together in the sea in big groups called 'schools' of fish. 
• In their school they feel safe from the bigger fish.

To scare away the bigger fish, some small fish drink up a lot of water, swell up and look big!

What a Catch!

• Fishermen in their boats, go up and down with the waves to catch fish. Ravi starts his trip when it is still dark in the morning.
• Ravi goes on a simple boat made from logs of wood. 
• If the sea is rough, with very high tides and a strong wind, then Ravi has a very difficult time.
  
• These log boats do not go very far. If the wind is helpful, they travel about 4 km in one hour.
• Fishermen can feel the wind and look at the sun to find out which way to go.

Out on the sea, fishermen look for a place where they hope to find a good catch of fish. There they spread their nets. They will have to wait for many hours for the fish to come into their nets.

• Some boats have motors and go further into the sea. Since they go far out they can catch more fish.
• Motor boats can travel at the speed of about 20 km in one hour.

Example 1: A log boat travels 4 km in one hour . How much time will it take to go 12 km?

Sol: Time taken by the boat to cover 4 km = 1 hour
Time taken by the boat to cover 12km (4km x 3) = 1 x 3 = 3 hours

Different Types of Boats

Some very big machine boats (trawlers) are also used by fishermen.

• They go far out and put their big nets deep in the sea. This way they collect a whole lot of fish, leaving very few near the sea shore. They also stay out on the sea for many days.
• These big machine boats also catch the small baby fish, which have yet to grow up.

Fishermen in the smaller boats always let the baby fish pass through their nets to go back into the sea. They choose a net size in such a way that only the grown up fish are caught.

For hundreds of years fishermen have cared for the sea and its fishes and fished only a little to eat and sell. 
They say that if trawlers catch thousands of kilograms of fish everyday, there will be no fish left in the sea.

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Which boat gets how much fishes?

Some Big, Big Numbers!

• Do you remember the number 'lakh', which is equal to a hundred thousand?
• But there are numbers even bigger than that!
• For example, do you know how many fishworkers are there in our country? About one hundred lakh!
• We also have a name for this big number: crore. 

How Many: Motor Boats in the Country

• There are about two lakh boats in our country. Half of them are without a motor.
• What is the number of boats with a motor? Let's find out!
• Two lakh can be written as 2,00,000. Half of two lakh would be 1/2 x 2,00,000 = 1,00,000.
• In other words, it is one lakh motor boats in the country!

How Many: Big Machine Boats

• About one fourth of the boats with a motor are big machine boats.
• How many thousand machine boats are there?
• Let's calculate! 
• Out of one lakh motor boats, 1/4th of them are big machine boats.
• This would be 1/4 x 1,00,000 = 25,000!

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The Fish Market

Fishes are sold in the fish market. Many boats bring back good catches. The fisher women shout out their prices to the buyers.

Following is the list of fisherwomen who sell a specific type of fish ,
Questions based on the table given above,

Example 1: Suppose Floramma sells 10 kg of prawns in a day. How much money did she get for that?

Sol:  Cost of 1 kg of prawns sold by Floramma = Rs 150
Cost of 10 kg of prawns sold by Floramma = Rs 150 x 10 = Rs 1500

Example 2: How much Kgs of squids can gracy can sell for Rs 500?

Sol: As we can see in the table ,Gracy sells 1 kg of squids for Rs 50
So, Amount of squids sold in Rs 50 = 1 kg
Amount of squids sold in Rs 500 = = 10 kg

Example 3: Basheer has Rs 100. He spends one-fourth of the total money on squid. How many kilograms of squid did he buy?

Sol: Basheer has Rs 100
Money spent on squid 

Cost of 1 kg of squid = Rs 50
Money spent by Basheer on squid = Rs 25
Amount of squids he bought  

Women's Meenkar Bank

This is a bank made by twenty fisher women. Each one of them saves Rs 25 every month and puts it in the bank. If someone needs money to buy net, boat etc. they take loan from the bank and later return it with interest.

• The women of Meenkar Bank also want to start a factory to dry fish. 
• The Panchayat has given them some land for that. 
• Over the years they have saved Rs 74,000.

Example 1: The meeting of the Meenkar Bank has just begun. Fazila is the President. 20 fisherwomen have made their own bank. Each saves Rs 25 every month and puts it in the bank. How much money does the group collect each month? 

Sol: As mentioned, There is a group of  20 fisherwomen, each saves Rs 25 per month.
so, Total amount saved by the group (20 women) = 20 x Rs 25 = Rs 500

Example 2: The table for the cost of each item and the number of items they want to buy for the factory is given below.

(a) Total cost to set up the factory ?

(b) When fresh fish Is dried, it becomes l /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?

Sol:

(a) Total cost to set up the factory = Rs 3000 + Rs 40000 + Rs 4000 + Rs 6000 + Rs 1500 = Rs 54,500
(b) Dried fish they will get in a month = 6000 kg /3 = 2000 kg