Joining conditions with AND and OR

Name:

Date:

Class:

Quick Questions

Shade in the A or B circle for each question.

1. A rule says: IF it is Saturday AND it is sunny THEN go to the beach. It is Saturday but it is raining. Do you go to the beach?

A Yes, because one condition is true

B No, because AND needs both conditions to be true

2. A rule says: IF it is Saturday OR it is sunny THEN go to the beach. It is Monday and it is sunny. Do you go to the beach?

A Yes, because OR needs at least one condition to be true

B No, because it is not Saturday

3. Which joining word is true only when both conditions are true?

A OR

B AND

4. Which joining word is true when at least one condition is true?

A OR

B AND

5. You can enter the school disco only if you have a ticket AND you are in Year 5 or 6. Which condition is written correctly?

A IF has ticket AND year is 5 or 6 THEN enter

B IF has ticket OR year is 5 or 6 THEN enter

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1IF it is Saturday AND it is sunny THEN		AThe steps run when at least one condition is true: rain, wind, or both.
2IF it is raining OR it is windy THEN		BIF it is raining OR it is very sunny THEN take umbrella
3Use AND when both things must be true before the school bag is packed for swimming		CThe steps run only when both conditions are true: it is Saturday and it is sunny.
4Use OR when either one of two things is enough to take an umbrella		DIF it is Tuesday AND it is swimming day THEN pack towel
5IF it is Saturday OR it is sunny THEN go to the beach (only on sunny Saturdays)		EOR lets the steps run on any Saturday or any sunny day. It should be AND because both must be true.
6IF score > 50 AND score < 20 THEN say "Try again"		FNo score can be both over 50 and under 20, so AND is never true. It should be OR if either one is enough.

Definitions

AND / OR

Fill in the Blanks

Complete each line of code by filling in the missing parts.

IF day = "Saturday" ___ weather = "sunny" THEN SAY "Go to the beach" END IF

IF day = "Saturday" __ day = "Sunday" THEN SAY "No school today" END IF

IF age >= 10 ___ age <= 12 THEN SAY "Join the group" END IF

__ ticket = "yes" AND money > 5 THEN SAY "Enter the show" END IF

IF mark < 40 __ mark > 90 THEN SAY "Check this mark" END IF

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A SET Saturday TO true

B SET sunny TO false

C IF Saturday OR sunny THEN

D SAY Go to the beach

Question 2

A IF raining AND cold THEN

B SAY Take a coat

C ELSE

D SAY No coat needed

Question 3

A INPUT age

B IF age>=10 AND <=12 THEN

C SAY Join the Year 5-6 club

D ELSE

E SAY Not this time

Question 4

A IF homework, chores THEN

B SAY You can play games

C ELSE

D SAY Finish your jobs first

Question 5

A SET hasTicket TO true

B SET hasPass TO false

C SET inside TO no

D IF hasTicket AND hasPass THEN

E SET inside TO yes

Answer Key

Joining conditions with AND and OR

Section A: Quick Questions

B — No, because AND needs both conditions to be true

A — Yes, because OR needs at least one condition to be true

B — AND

A — OR

A — IF has ticket AND year is 5 or 6 THEN enter

Section B: Match the Pairs

IF it is Saturday AND it is sunny THEN → The steps run only when both conditions are true: it is Saturday and it is sunny.

IF it is raining OR it is windy THEN → The steps run when at least one condition is true: rain, wind, or both.

Use AND when both things must be true before the school bag is packed for swimming → IF it is Tuesday AND it is swimming day THEN pack towel

Use OR when either one of two things is enough to take an umbrella → IF it is raining OR it is very sunny THEN take umbrella

IF it is Saturday OR it is sunny THEN go to the beach (only on sunny Saturdays) → OR lets the steps run on any Saturday or any sunny day. It should be AND because both must be true.

IF score > 50 AND score < 20 THEN say "Try again" → No score can be both over 50 and under 20, so AND is never true. It should be OR if either one is enough.

Section C: Definitions

AND / OR — AND is true only when both conditions are true. OR is true when at least one is true. Saturday AND sunny needs both; Saturday OR sunny needs just one.

Section D: Fill in the Blanks

IF day = "Saturday" AND
 weather = "sunny" THEN
  SAY "Go to the beach"
END IF

IF day = "Saturday" OR day = "Sunday" THEN
  SAY "No school today"
END IF

IF age >= 10 AND age <= 12 THEN
  SAY "Join the group"
END IF

IF ticket = "yes" AND money > 5 THEN
  SAY "Enter the show"
END IF

IF mark < 40 OR mark > 90 THEN
  SAY "Check this mark"
END IF

Section E: Spot the Error

C — The plan needs BOTH things true, so it must use AND. With OR, it is Saturday so the beach plan would run even though it is not sunny. It should be: IF Saturday AND sunny THEN.

A — You need a coat if it is raining or if it is cold, so just one condition is enough. That needs OR. With AND, you would only get a coat when both are true. It should be: IF raining OR cold THEN.

B — Each side of AND is a full condition of its own, so the second one needs the variable too. It should be: IF age>=10 AND age<=12 THEN.

A — Conditions are joined with the word AND (or OR), not with a comma. It should be: IF homework AND chores THEN.

D — A person gets in with a ticket or a pass, so only one needs to be true. That needs OR. With AND, this person (who has a ticket but no pass) would be kept out. It should be: IF hasTicket OR hasPass THEN.