Find the missing part of a subtraction story
Lesson details
Learning outcome
I can find the missing part of a subtraction story when the other two parts are known.
Key learning points
- When an amount is changed by subtracting, to undo the change, we must add the same amount back on.
- The amount that has been subtracted can be found using the known parts.
Keywords
Add - To find the total, or sum, by combining two or more parts, or to increase an amount by adding another.
Subtract - To partition one part from another, or to decrease an amount by taking an amount away.
Then - After something in time.
Common misconception
On recognising the subtraction symbol, children may believe that the two parts known must be subtracted from each other, regardless of which part of the equation is missing.
Use practical equipment on 'First, then, now' boards and on part-part-whole models to demonstrate additive relationships and encourage them to use their number sense to think about and predict plausible answers.
Teacher tip
Provide a range of opportunities for children to tell / act out their own stories and explain their reasoning. As well as matching missing number equations to stories, also match missing number stories to equations to strengthen understanding of how the abstract relates to the concrete.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Use the picture to tell the story. Which amount will be at the end of the story?
Q2.Look at the picture. If you wrote an equation, which number would represent the sum?
Q3.Match each pair of addends to the correct sum.
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Q4.Use the picture to tell the story and find out how many balls were left at the end of the story.
Q5.Listen to story and choose the equation that would represent it.
First, there were 7 birds on the branch. Then, 2 birds flew away. Now there are ___ birds on the branch.
Q6.Solve each equation and match to the correct answer.
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Assessment exit quiz
6 Questions
Q1.Which tens frame represents the starting amount in this subtraction story?
Q2.What amount is missing from this equation? Use the picture to help.
Q3.Which equation represents this 'First, then, now' story?
Q4.There were some books on a book shelf.
Then, 4 books fell off.
Now, there are 6 books on the shelf.
How many books were on the shelf at the start of the story?
Q5.Complete this equation. − 3 = 1
Q6.Complete this equation. − 2 = 8
To help you plan your 1 maths lesson on: Find the missing part of a subtraction story, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 1 maths lesson on: Find the missing part of a subtraction story, 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 and subtraction unit, dive into the full primary maths curriculum, or learn more about lesson planning.