Using bar models to subtract
Lesson details
Learning outcome
I can use bar models to represent and solve subtraction problems.
Key learning points
- A bar model can be used to represent subtraction problems and equations.
- Overlaying manipulatives on a bar model can be useful for helping to solve subtraction problems and equations.
Keywords
Subtract - To separate or take away one number from another, or to decrease an amount.
Known part - A piece or section of the whole that is known.
Unknown part - A piece or section of the whole that is not known.
Common misconception
Children may muddle the order of the numbers on a bar model and in a subtraction equation.
If children are not secure, then return to the concrete to secure understanding of this structure of subtraction.
Teacher tip
Offer opportunities for children to manipulate bar models (made with Cuisenaire rods or cut up pieces of card) to deepen their understanding of the partitioning structure of subtraction.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Look at the equation 8 – 2 = 6 Which number represents the part to be subtracted from the whole?
Q2.Match the word to the correct description for 10 - 3 = 7.
Q3.Tick the equation that correctly matches the picture.
Q4.Which picture matches this equation? 10 – 3 = 7
Q5.Jun has written an equation to represent the picture 5 - 1 = 4 Is the equation correct or incorrect?
Q6.Complete the equation 9 – 5 =
Assessment exit quiz
6 Questions
Q1.Which bar model has a whole of 6?
Q2.Which bar model represents this picture?
Q3.Tick the equation that represents this bar model.
Q4.Which bar model cannot represent this equation? 7 – 3 = 4
Q5.Tick the subtraction equations that match the bar model.
Q6.Which story could be represented by this bar model?
To help you plan your 1 maths lesson on: Using bar models to subtract, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 1 maths lesson on: Using bar models to subtract, 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 1 maths lessons from the Additive structures: addition unit, dive into the full primary maths curriculum, or learn more about lesson planning.