Scratch : corrected algorithms and programming exercises in 4th grade in PDF.

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Answers to the programming exercises with scratch in the fourth grade of cycle 4.

Exercise 1:

What does the leprechaun announce at the end of the program?


This sprite announces 2*(10+1)=2*11=22.

Exercise 2:

What is the value of the number variable at the end of these two programs?


Program 1: 0+1+1+1+1+1+1+1+1+1+1+1=10

Program 2: 0+1+2+3+4+5+6+7+8+9+10=55

Exercise 3:

What plot do you get with this program?

What is the abscissa of the ball sprite once the program is executed?


The program executes plot 3.

Exercise 4:

What does the cat say at the end of the program?


The program quotes the numbers from the list.

Exercise 5:

We ran the program and entered 13 and 8.

What were the elf’s responses?


The elf’s responses are “That doesn’t work for me” and then “Thank you!”.

Exercise 6:

What does the cat say at the end of the program?


The cat says the whole list of numbers contained in maliste.

Exercise 7:

The user has entered the values 15 and 9.

What are the values of variables a and b at the end of each of these two programs?scratch-ex7

Program 1: a=9 and b=15.

Program 2: a=9 and b= 9.

Program 3: a=9 and b= 9.

Exercise 8:

If the butterfly touches the bat then the game is lost!

But the program does not work.

Why is this?


The program does not work because of the “stop-all” brick.

Exercise 9:

Which instruction calculates 3 + 4×5 – 2?


This is instruction 4.

Exercise 10:

Is it possible that the cat announces 750?

What is the maximum number that can be obtained?


This program will provide as maximum result :

10\times  ,9\times  ,8+10+9+8=720+27=747.

It is impossible for this program to provide 750.

The answers to the exercises on Scratch in 4th grade.

After having consulted the answers to these exercises on Scratch in 8th grade, you can return to the exercises in 8th grade.

Eighth grade exercises.

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