AND, OR and NOT

Name:

Date:

Class:

Quick Questions

Shade in the A or B circle for each question.

1. Which statement about AND is correct?

A Age >= 13 AND Age <= 19 is true if either test is true

B Age >= 13 AND Age <= 19 is true only if both tests are true

2. Which statement about OR is correct?

A Day = "Sat" OR Day = "Sun" is true if at least one test is true

B Day = "Sat" OR Day = "Sun" is true only if both tests are true

3. Number is 5. Which result is correct for Number >= 1 AND Number <= 10?

A FALSE

B TRUE

4. Number is 15. Which result is correct for Number >= 1 AND Number <= 10?

A FALSE

B TRUE

5. Which is the correct range test for a number from 1 to 10 inclusive?

A IF Number >= 1 AND Number <= 10 THEN

B IF Number >= 1 OR Number <= 10 THEN

Match the Pairs

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

Left column		Right column
1IF Age >= 13 AND Age <= 19 THEN		AIF Day = "Sat" OR Day = "Sun" THEN
2IF NOT (Score > 50) THEN		BTrue only when both conditions are true, so Age is in the range 13 to 19
3OR needs only one condition to be true, so a Day of Saturday or Sunday passes		COR is used instead of AND, so the test is true for every number. A range test needs both conditions true, so use AND.
4A range test checks that Number is at least 1 and at most 10 by joining two comparisons with AND		DIF Number >= 1 AND Number <= 10 THEN
5IF Number >= 1 OR Number <= 10 THEN		EThe second condition is incomplete because Age is missing after AND. Each side of AND must be a full condition: Age <= 19.
6IF Age >= 13 AND <= 19 THEN		FReverses the condition, so it is true when Score is 50 or less

Definitions

AND, OR, NOT

Fill in the Blanks

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

IF Number >= 1 ___ Number <= 10 THEN OUTPUT "Valid" ENDIF

IF Answer = "Y" __ Answer = "y" THEN OUTPUT "Yes" ENDIF

IF ___ Found THEN OUTPUT "Not found" ENDIF

IF Number >= 1 AND Number __ 10 THEN OUTPUT "In range" ENDIF

IF Score < 0 __ Score > 100 THEN OUTPUT "Invalid" ENDIF

Spot the Error

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

Question 1

A DECLARE Num : INTEGER

B INPUT Num

C IF Num >= 1 OR Num <= 10

D THEN OUTPUT "In range"

E ENDIF

Question 2

A INPUT Age

B IF Age >= 13 AND <= 19

C THEN OUTPUT "Teenager"

D ENDIF

Question 3

A INPUT Mark

B IF Mark >= 0 AND Mark <= 100

C THEN OUTPUT "Valid"

D ELSE OUTPUT Invalid

E ENDIF

Question 4

A Found ← FALSE

B INPUT Name

C IF Name = "Ali" OR Name = "Bo"

D THEN Found = TRUE

E ENDIF

Question 5

A INPUT Raining

B IF Raining NOT THEN

C OUTPUT "Go outside"

D ENDIF

Answer Key

AND, OR and NOT

Section A: Quick Questions

B — Age >= 13 AND Age <= 19 is true only if both tests are true

A — Day = "Sat" OR Day = "Sun" is true if at least one test is true

B — TRUE

A — FALSE

A — IF Number >= 1 AND Number <= 10 THEN

Section B: Match the Pairs

IF Age >= 13 AND Age <= 19 THEN → True only when both conditions are true, so Age is in the range 13 to 19

IF NOT (Score > 50) THEN → Reverses the condition, so it is true when Score is 50 or less

OR needs only one condition to be true, so a Day of Saturday or Sunday passes → IF Day = "Sat" OR Day = "Sun" THEN

A range test checks that Number is at least 1 and at most 10 by joining two comparisons with AND → IF Number >= 1 AND Number <= 10 THEN

IF Number >= 1 OR Number <= 10 THEN → OR is used instead of AND, so the test is true for every number. A range test needs both conditions true, so use AND.

IF Age >= 13 AND <= 19 THEN → The second condition is incomplete because Age is missing after AND. Each side of AND must be a full condition: Age <= 19.

Section C: Definitions

AND, OR, NOT — Logic operators that combine or reverse conditions: AND needs both true, OR needs one true, NOT reverses a condition. Range test: Number >= 1 AND Number <= 10

Section D: Fill in the Blanks

IF Number >= 1 AND Number <= 10 THEN
  OUTPUT "Valid"
ENDIF

IF Answer = "Y" OR Answer = "y" THEN
  OUTPUT "Yes"
ENDIF

IF NOT Found THEN
  OUTPUT "Not found"
ENDIF

IF Number >= 1 AND Number <= 10 THEN
  OUTPUT "In range"
ENDIF

IF Score < 0 OR Score > 100 THEN
  OUTPUT "Invalid"
ENDIF

Section E: Spot the Error

C — A range test needs both conditions to be true, so it must use AND. With OR, every number passes, because each number is either at least 1 or at most 10. It should be IF Num >= 1 AND Num <= 10.

B — AND joins two complete conditions, and the second one has lost its variable. Each side needs its own comparison: IF Age >= 13 AND Age <= 19.

D — Text output must be in double quotes. The line should be ELSE OUTPUT "Invalid".

D — Assigning a value uses the arrow ←, not =. In Cambridge pseudocode = is a comparison. The line should be THEN Found ← TRUE.

B — NOT goes in front of the condition it reverses, not after it. It should be IF NOT Raining THEN.