Logical operators
Lesson details
Learning outcome
I can use logical operators to build more complex selection statements.
Key learning points
- Logical operators are often used when you need to evaluate multiple relational expressions to return a single value.
- Logical expressions return as either True or False. The three basic logical operators are and, or, and not.
- Logical expressions can be used in selection statements.
Keywords
Logical expression - an expression that combines relational and logical operators
Selection - used when there is more than one possible path for a program to follow
Common misconception
A logical expression can only check one value.
Logical expressions can combine relational and logical operators to check multiple values or inputs.
Teacher tip
Comparing values of objects is a useful way to visualise the use of realtional operators. Props in the classroom help make these comparisons more concrete.
Equipment
All pupils requires access to devices that can edit and run Python programs. Starter code files are available to copy or use directly via the Raspberry Pi Code Editor.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.A compares two values and produces the result of True or False.
Q2.Match the arithmetic operator to the symbol:
Q3.Write the if statement command to check if the value stored in the variable called num is 10 or more.
Q4.What will be displayed if score is 5?
123456if score < 5:
print ("You lose")
elif score <= 10:
print ("Not bad!")
else:
print ("You win")Code colour
Q5.What will be displayed if score is 10?
123456if score < 5:
print ("You lose")
elif score <= 10:
print ("Not bad!")
else:
print ("You win")Code colour
Q6.What will be displayed if score is 11?
123456if score < 5:
print ("You lose")
elif score <= 10:
print ("Not bad!")
else:
print ("You win")Code colour
Assessment exit quiz
6 Questions
Q1.What is the purpose of logical operators in programming?
Q2.Which of the following is True when both conditions are True?
Q3.The expression `(5 > 3) and (10 < 20)` evaluates to .
Q4.Which logical operator is used to reverse the result of a condition?
Q5.The expression `(8 < 3) and (5 > 2)` evaluates to .
Q6.What will be displayed if the user inputs "king" for value and "hearts" for suit?
123456
if value == "king" and suit == "hearts":
print("Match")
else:
print("Not a match")
Code colour
To help you plan your 10 computer science lesson on: Logical operators, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 10 computer science lesson on: Logical operators, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 4 computer science lessons from the Programming: selection unit, dive into the full secondary computer science curriculum, or learn more about lesson planning.