1. Session 5 of 10 Review + Multiple Sprites
Scratch Programming
Session 5 of 10
Review + Multiple Sprites

2. Objectives for Session 5
Review Binary
Review Algorithms
Multiple sprites

3. Binary
What is Binary?
What Numbers are used in Binary?

4. Binary conversion Algorithm
Convert 25 into binary
1/2 =
3/2 =
6/2 =
12/2 =
25/2 =
25 in Binary is 11001

5. Try these examples on your own:
Convert to Binary: 36 52 67
1342
Bonus: convert this from binary to decimal
110011

6. The other way around
How do you convert into Base 10 (our number system)?
= 33 16 8 4 2 1

7. Try these numbers
010101
011111
000011 32 16 8 4 2 1

8. Game 2 Teams (Left Side vs. Right Side)
The number must be:
Less than 7 digits in binary or
Less than 100 in Base 10
2 Teams (Left Side vs. Right Side)
Each team comes up with a number, in binary or in base 10
The other team has to convert it.
30 seconds to answer
Highest Score after 5 rounds wins!

9. ASCII
ASCII stands for the American Standard Code for Information Interchange
It’s a way for computers to represent letters or characters in Binary
Each letter or symbol gets a specific sequence of numbers

10. ASCII
Example
The character “A” is represented in binary as
The character “a” is represented as
All the characters are represented in some form of this binary code

11. Dr. Stockman’s Block Coding Activity
Close Scratch
Dr. Stockman’s Block Coding Activity

12. Algorithms What are Algorithms again?
Instructions or Recipes for how to do a specific thing, such as find the area of a square
What Algorithms have we done before?
Area of a Square, Perimeter, Area of a triangle, Average number of people
What other Algorithms can you think of?

13. Variable Practice Let’s calculate the distance between 2 points
First, we ask the user for point 1
Ask “What is point 1” and wait
Then we save that as a variable
Set point1 to answer
Now do the same for Point 2

14. Variable Practice Cont.
Now we need to find the distance between the 2 points
Set Result to Point2 – Point1
Say Result

15. Exercise: Calculate Average Age
Calculate the Average of two ages
Hints:
3 Variables (Age1, Age2, Result)
Ask for Age1 and Age2
Average of 2 ages is (Age1+Age2)/2
Say the Result
Show us when you’re done
BONUS: Can you make it average more than 2 people?

16. Multiple Sprites
So far, we’ve only been using a single sprite to do everything.
Scratch is designed to handle more than one Sprite

17. Adding A new sprite
On the bottom left panel of scratch, click “import sprite”
Choose the sprite you want to import
Click “okay”

18. Important things to know
Notice that the scripts from your first sprite are NOT visible when you have this sprite selected
Any scripts you add to this sprite will only work with THIS SPRITE.

19. Naming your sprites
Something helpful when you have multiple sprites is Naming them something you’ll recognize later.
Lets do this now:

20. Changing a Sprite’s name
Click on the sprite whose name you want to change
Click in the Box near the sprite’s picture
Type in the new name and hit enter

21. Review You now know: How to convert a number to and from binary
How computers recognize numbers and letters
How to make an algorithm in Scratch
How to add additional sprites to your Scratch Program