Making a variable
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which variable name is clearest for storing a player's points in a game?
2. What does the Make a Variable button do?
3. You want to keep track of how many lives a player has left. Which name is best?
4. A variable called timer is ticked in the variable list. What happens?
5. You untick the box next to the score variable. What happens to score?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1Make a Variable | AThis is not the real problem. The score would show on the stage if the box is ticked. A player who can't see it means the box is unticked, so tick it to show the variable. | |
| 2[x] score (tick box) | BMake a Variable: lives left | |
| 3A clear name tells you what the variable stores | CThe name x is not clear. It does not tell you what the variable stores. A better name is score or lives left. | |
| 4Hide a variable from the stage by unticking its box | DShows the score variable on the stage so the player can see it | |
| 5Make a Variable: x | ECreates a new named box that can store a value, such as a score | |
| 6Player cannot see the score, but the score box is ticked and the variable is made | F[ ] score (box unticked) |
C
Definitions
Make a Variable
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
Click _______________, then type a name
2.
// counts the points a player earns
Make a Variable named _____
3.
____ variable [score]
4.
hide ________ [score]
5.
Untick the box to ____ score on the stage
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
Make a Variable: score
B
set scor to 0
C
show variable score
Question 2
A
Goal: show the score on stage
B
Make a Variable: score
C
when green flag clicked
D
hide variable score
Question 3
A
Make a Variable: lives
B
when green flag clicked
C
set 3 to lives
Question 4
A
Make a Variable: time left
B
when green flag clicked
C
set time to 30
D
show variable time left
Question 5
A
Make a Variable: x
B
set score to 0
C
show variable score
Answer Key
Making a variable
Section A: Quick Questions
Q1
B — score
Q2
A — Creates a named box that can store a value
Q3
A — lives
Q4
B — Its value is shown on the stage
Q5
A — It is hidden from the stage but still exists
Section B: Match the Pairs
Q1
Make a Variable → Creates a new named box that can store a value, such as a score
Q2
[x] score (tick box) → Shows the score variable on the stage so the player can see it
Q3
A clear name tells you what the variable stores → Make a Variable: lives left
Q4
Hide a variable from the stage by unticking its box → [ ] score (box unticked)
Q5
Make a Variable: x → The name x is not clear. It does not tell you what the variable stores. A better name is score or lives left.
Q6
Player cannot see the score, but the score box is ticked and the variable is made → This is not the real problem. The score would show on the stage if the box is ticked. A player who can't see it means the box is unticked, so tick it to show the variable.
Section C: Definitions
Q1
Make a Variable — A block button that creates a named box to store a value, like a score. You choose a clear name, and a tick box shows or hides the variable on the stage.Section D: Fill in the Blanks
Q1
Click Make a Variable, then type a nameQ2
// counts the points a player earns
Make a Variable named scoreQ3
show variable [score]Q4
hide variable [score]Q5
Untick the box to hide score on the stageSection E: Spot the Error
Q1
B — The variable was made with the name score, but this line uses scor. A variable name must match exactly. It should be: set score to 0
Q2
D — The goal is to show the score on the stage, but this block hides it. It should be: show variable score
Q3
C — The set block needs the variable name first and then the value. It should be: set lives to 3
Q4
C — The variable is called time left, not time. The name must match exactly, so it should be: set time left to 30
Q5
A — The name x does not tell us what is stored, and it does not match the later lines. Choose a clear name: Make a Variable: score