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Year 8 Computing — Combining conditions with and, or and not

Work out whether a condition joined by and, or or not comes out true, and which branch a program takes because of it.

Name: ________________________

  1. 1.A program prints "Go" only when the light is green and the road is clear, and prints "Wait" otherwise. Sort each situation by what it prints.

    Groups: Go · Wait

    • The light is red and the road is clear
    • The light is green and nothing is standing on the road
    • The light is red and the road is blocked
    • The light is green and the road is clear
    • The light is green and the road is blocked

  2. 2.A program says: if the number is more than 10 and less than 20, print "Middle"; otherwise print "Outside". The number is 12. What does it print?

  3. 3.Match each condition to the smallest whole number that makes it true.

    • more than 3 and more than 7
    • more than 3 or more than 7
    • at least 5 and at least 9
    • at least 5 or at least 9
    • more than 0 and at least 2
    • 8
    • 2
    • 4
    • 9
    • 5

  4. 4.A condition says: not (the number is more than 10). The number is 3. Is the condition true?

    • a) Only when the number is 10
    • b) No
    • c) Yes
    • d) There is no way to tell

  5. 5.A condition says: the number is more than 10 and the number is less than 20. The number is 15. Is the condition true?

    • a) Only if the two halves are equal
    • b) There is no way to tell
    • c) No
    • d) Yes

  6. 6.A program says: if the number is not more than 10, print "Small"; otherwise print "Large". The number is 30. What does it print?

  7. 7.A condition says: the number is more than 50 and the number is less than 10. Which numbers make it true?

    • a) Every number
    • b) No number at all
    • c) The numbers between 10 and 50
    • d) Only 10 and 50 themselves

  8. 8.A condition says: the number is more than 5 or the number is more than 50. Which numbers make it true?

    • a) Every number above 5
    • b) Only the numbers between 5 and 50
    • c) No number at all
    • d) Only the numbers above 50

Answer key — Year 8 Computing — Combining conditions with and, or and not

  1. 1. The light is green and the road is clear → Go; The light is green and the road is blocked → Wait; The light is red and the road is clear → Wait; The light is red and the road is blocked → Wait; The light is green and nothing is standing on the road → Go
  2. 2. Middle
  3. 3. more than 3 and more than 7 → 8; more than 3 or more than 7 → 4; at least 5 and at least 9 → 9; at least 5 or at least 9 → 5; more than 0 and at least 2 → 2
  4. 4. c) Yes
  5. 5. d) Yes
  6. 6. Large
  7. 7. b) No number at all
  8. 8. a) Every number above 5