Comparison blocks: >, < and =
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. What does a comparison block like score > 10 report?
2. The score variable is 15. Which block is true?
3. Which symbol means 'less than'?
4. The lives variable is 3. What does lives = 3 report?
5. The score variable is 4. What does score > 10 report?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1score > 10 | AReports true when the lives variable is less than 3, otherwise false | |
| 2lives < 3 | Btimer > 30 | |
| 3An equals block is true only when both values are exactly the same | Canswer = 7 | |
| 4Comparing a variable to a number to see if it is bigger than the number | DUsing < 0 means less than 0, which is never true for lives that stop at 0. Use lives = 0 to check for no lives. | |
| 5if score > 10 then say 'Win' (checking for exactly 10 using >) | EUsing > when you want to check for exactly 10. The > block is false when the score is 10. Use = instead. | |
| 6lives < 0 (to check the player has no lives left) | FReports true when the score variable is greater than 10, otherwise false |
C
Definitions
score > 10
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
if <score _ 10> then
2.
if <lives _ 3> then
say (Careful!) for 2 seconds
3.
if <answer _ 7> then
say (Correct!) for 2 seconds
4.
set score to 12
if <_____ > 10> then
say (You win!) for 2 seconds
5.
set score to 8
<score < 10> reports ____
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
when green flag clicked
B
set score to 12
C
if score < 10 then
D
say Your score is over 10!
E
end
Question 2
A
set lives to 0
B
if lives == 0 then
C
say Game over
D
end
Question 3
A
if age > 10 then
B
say You are under 10
C
else
D
say You are 10 or older
E
end
Question 4
A
if score > then
B
say Top score!
C
end
Question 5
A
set coins to 7
B
if coins is 7 then
C
say I have 7 coins
D
end
Answer Key
Comparison blocks: >, < and =
Section A: Quick Questions
Q1
A — true or false
Q2
A — score > 10
Q3
B — <
Q4
B — true
Q5
A — false
Section B: Match the Pairs
Q1
score > 10 → Reports true when the score variable is greater than 10, otherwise false
Q2
lives < 3 → Reports true when the lives variable is less than 3, otherwise false
Q3
An equals block is true only when both values are exactly the same → answer = 7
Q4
Comparing a variable to a number to see if it is bigger than the number → timer > 30
Q5
if score > 10 then say 'Win' (checking for exactly 10 using >) → Using > when you want to check for exactly 10. The > block is false when the score is 10. Use = instead.
Q6
lives < 0 (to check the player has no lives left) → Using < 0 means less than 0, which is never true for lives that stop at 0. Use lives = 0 to check for no lives.
Section C: Definitions
Q1
score > 10 — A comparison block checks two values and reports true or false. This one is true when the score variable is greater than 10. Use < for less than and = for equal to.Section D: Fill in the Blanks
Q1
if <score > 10> thenQ2
if <lives < 3> then
say (Careful!) for 2 secondsQ3
if <answer = 7> then
say (Correct!) for 2 secondsQ4
set score to 12
if <score > 10> then
say (You win!) for 2 secondsQ5
set score to 8
<score < 10> reports trueSection E: Spot the Error
Q1
C — The program says the score is over 10, so it needs 'greater than' (>). With < the block checks for less than 10, which is false when the score is 12. It should be: if score > 10 then.
Q2
B — The equals comparison block uses a single = sign, not two. It should be: if lives = 0 then.
Q3
A — The message says the person is under 10, so the block must use 'less than' (<). It should be: if age < 10 then.
Q4
A — A comparison block needs two values, one on each side of the symbol. The number 10 is missing. It should be: if score > 10 then.
Q5
B — There is no 'is' comparison block. To check if two values are equal, use the = block. It should be: if coins = 7 then.