The future of our world is in the hands of technology, and learning about technology is no longer a requirement; it is now a responsibility, and in this computer generation, everyone should learn how to code.

Coding helps people to think innovatively and creatively. Coding has become essential for children’s education. 

There are simple logic and mathematical operations such as “How To Find A Prime Number,”  that children would not understand, but coding simplifies everything.

Today, we’ll use block-based coding to learn about prime numbers and learn how to find a prime number in Scratch.

Let’s take a closer look at what a Prime Number is and how children can learn about it more easily.

What Is Prime Number 

A Prime number is just like any other number; the only difference is that it can only be divided by one and itself. 

To put it another way, if a number is divided by 1 and itself, the remainder is 0, but if it is divided by another number and the remainder is still zero, the number is not a prime number.

An example of a Prime number would be 2: if we divide 2 by 1 and 2 (itself), the remainder is 0, indicating that 2 is a prime number. 

On the other hand, for example, 8 can be divided by 1,2,4,8, even if the remainder is 0 it is a non-prime number because it is divided by more numbers than just 1 and 8.

About Scratch Platform

Scratch is an online programming platform that we use to create games as well as narrate and create our own stories.

Scratch is designed for students aged 8 to 16, and anyone, regardless of age, can use it. Most children find it easy to use because it is block-based and simple to use.

How To Create an Account On Scratch

First and foremost, we must create an account in Scratch. This link will take you to scratch, where you can create an account by providing a unique username and a simple password.

To begin creating, select the Create option.

There will be a cat that will be our character in Scratch called a sprite, and you can add or delete spites by clicking on the cat icon on the left side. 

You can also add a background by clicking on the image icon.

There is a green flag to start the game and a red button to stop it.

The middle section is known as the script editor, the left section with the codes is known as the code palette, and the right side white space with the cat is known as the stage area.

Steps To Find Prime Number In Scratch  

We learned the hard way that knowing the prime number from an infinite number is difficult, so with the help of scratch and block-based coding, we can easily determine whether the number is prime or not.

Step 1: You should be clicking on create to start creating our project on how to find a prime number in Scratch. 

Step 2: To start the project we should activate the green flag so give a code “WHEN FLAG CLICKED” from events to the SCRIPT EDITOR.

Step 3:Now let’s add an “ASK (what’s the number?) and wait” code from SENSING. This code is used for letting the cat ask us what number do we want to find. 

Step 4: Now, create a variable by clicking on VARIABLES. Then, create a variable as a number and insert the code “set number to” under ask. 

Now, add that and answer from sensing to that because we’re going to use our number as the answer.

Step 5: Now, when the cat asks, click on the Flag on stage and type a number. Let’s say you gave the number 9. Now,  we need to find the factors of that number, which is 9 divided by 8,7,6,….1…

Step 6: To divide the numbers to find the factors of 9, create a variable called divider that will be used for dividing with numbers.

Step 7: We can now add the code “set (divider)to (answer)-1.” As a result, it divides the number 9 one by one in decreasing order, which is by (-1). “answer – 1” should be kept inside the operator, which can be obtained from operators.

Step 8:We can now use mod from operators to get the remainder, so in the mod add “number mod divider” instead of 9, give numbers from variables, and in place of 8 give divider from variables. 

Step 9: Now, if the number mod divider is greater than zero, the remainder should be zero, so we should add an “IF” block from control and then add the mode code inside it.

Step 10: Now, if the number is divisible and the remainder is 0, it has factors and should be a non-prime number.

Step 11: Now add a “say (It’s not a prime number) for 2 seconds” into the if block.

Step12: Now that we should get the result for any number we provide, we must add a “repeat until” code from control before the if block. 

As a result, it should continue until divider = 1, you can use the equal operator from operators.

Step13: Add a decrease code in that loop which changes the divider by -1. 

Step14: Finally, add a code that says “say (it’s a prime number) for 2 seconds.” If all of this fails, the number will be prime, which means it is only divisible by 1 and itself.

Conclusion

Scratch has enabled the creation of various types of projects through the use of coding. We learn about various programming and mathematical concepts as we work on these projects.

In this blog, we learned how to find a prime number in Scratch, which can be extremely useful for children because prime numbers often leave them scratching their heads. 

To refer to the original project click here!

Learn Scratch at BrightChamps with its specially designed curriculum that makes learning programming easy for students in Grade 1-12.

BrightChamps also teaches a variety of other programs that help kids build a foundation in computer programming through activities, interactive lessons, and other means.

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