# Scratch: programming exercises in 5th grade.

Exercises with Scratch in order to work on the algorithm and programming part for the students of fifth grade in cycle 4.
Assimilation of the different commands and bricks and understanding of algorithms.

Exercise 1:

Where is the cat when you click on the block?

I click on but the program does not work. Why is this?

When you click on the block, the cat moves forward 100 pixels.

The program does not work because the brick containing is not inserted in the program.

Exercise 2:

Initially, the cat is located at x=0 and y= – 50.

What will happen if we throw it several times ?

How to solve this problem?

The cat moves forward 10×20=200 pixels so if you run this program several times , it will come out of the background.

We can solve this problem by inserting a brick at the start that gives the initial position of the sprite.

Exercise 3:

Program D has just been executed.

Exercise 4:

This program constructs a rectangle of length 100 pixels and width 50 pixels.

Exercise 5:

Which of these three programs has just been run?

The C program has just been executed.

Exercise 6:

The dog must go to his friend the frog for his birthday.

But first he must retrieve the gift while avoiding the lion.

Which of these three programs is appropriate?

Program C is suitable.

Exercise 7:

When the program starts, what will the lion do?

The lion will retrieve the green marble and return to its original position.

Exercise 8:

Which of these three programs has just been executed?

The C program has just been executed.

Exercise 9:

After the execution of one of the two programs and after having proposed the number 10, the cat announced 35.

If we had run the other program, what result would have been announced?

Program B has been executed.

If program A is executed by taking 10, the sprite would have announced (5+3)*10=8*10=80.

Exercise 10:

the cat is positioned in (0;0) and the tree in (70;0).

We launch the program.

What is the probability that the cat will reach the tree?

The probability is 0.7.

What is the probability that the cat will pass the tree?

The probability is 0.3.

## Answers to the exercises on Scratch and programming in 5th grade.

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