Computer science · Grades 2–4
IF, THEN, ELSE
Study guide for Grades 2 to 4: 2 worked examples and 2 practice questions. Check the condition first. Only one branch runs: THEN when it is true, ELSE when it is false.
Rule and key idea
Check the condition first. Only one branch runs: THEN when it is true, ELSE when it is false.
IF condition is true → THEN part · otherwise → ELSE part
Worked examples
Rule: IF the number is equal to 13, THEN say “big”, ELSE say “small”. The number is 10. What does the program say?
10 is not equal to 13: the condition is false, so the ELSE part runs.
small
Rule: IF the number is greater than 6, THEN say “big”, ELSE say “small”. The number is 4. What does the program say?
4 is not greater than 6: the condition is false, so the ELSE part runs.
small
Try two questions
Rule: IF the number is greater than 16, THEN say “big”, ELSE say “small”. The number is 18. What does the program say?
- big
- small
Rule: IF the number is less than 18, THEN say “star”, ELSE say “moon”. The number is 20. What does the program say?
- moon
- star
Answers and reasoning
Answers and marking notes
- big
18 is greater than 16: the condition is true, so the THEN part runs.
- moon
20 is not less than 18: the condition is false, so the ELSE part runs.
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