Logic statements and expressions
Lesson details
Learning outcome
I can evaluate and develop logic statements using Boolean logic.
Key learning points
- A logic statement is a statement that evaluates to either True or False.
- You can write a logic statement to represent an outcome where the result is dependent on Boolean variables.
- Boolean logic combines multiple logic statements into an expression that is either True or False.
Keywords
Boolean - an expression that evaluates to either True or False
Logic statement - an expression that is either True or False
Logic expression - a combination of logical operators and variables that is either True or False
Common misconception
Boolean logic statements should be processed in the order they are read (from left to right).
Boolean operators have an order of precedence that affects the which operator applies to which variable. If a different order is required, brackets should be used.
Teacher tip
A visualiser is useful to model how descriptive statements can be reduced down to a set of variables and Boolean operators. Pupils benefit from understanding how this abstraction process is carried out.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.What type of data does a logic gate process, where each value can only be True or False?
Q2.Which logic gate does the following symbol represent?
Q3.Which type of logic gate is used when the output is True when at least one input is True?
Q4.Match the logic gate to the description.
Both inputs need to be True in order give the output True.
Only one input needs to be True in order to give the output True.
The input must be False to give the output True.
Q5.We are building a truth table with two inputs for the expression A AND B. Put the inputs into the order most people would use to ensure all possibilities have been accounted for.
Q6.Which of these are inputs for this statement? “If it is after 9.45 PM on a weekday and it is not the school holidays, I will go to bed.”
Assessment exit quiz
6 Questions
Q1.Match the terms to the correct definitions.
a data type that can have one of two possible values (True or False)
a combination of logical operators and variables
a set of two or more logic gates to allow for more complex logic
an electronic component that carries out a logical operation
Q2.If A = True, B = True and C = False, which of these is a correctly evaluated expression?
Q3.What is output for this expression when A = True, B = False and C = False? NOT (A OR B) AND C
Q4.Label the output for this sentence: “If it is raining and not windy, I take an umbrella.”
Q5.Write this expression another way so that the logic is still the same: X = A OR (NOT B)
Q6.Write an expression for this sentence: “I’ll go swimming (S) if my friend (F) is coming and the pool (P) is open.”
To help you plan your 10 computer science lesson on: Logic statements and expressions, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 10 computer science lesson on: Logic statements and expressions, 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 Boolean logic unit, dive into the full secondary computer science curriculum, or learn more about lesson planning.