Represent a change story using addition and subtraction symbols
Lesson details
Learning outcome
I can represent a change story using addition and subtraction symbols.
Key learning points
- A change can be positive or negative.
- A change can be represented by a negative number.
Keywords
Positive change - An overall amount has increased.
Negative change - An overall amount has decreased.
Negative number - Any value less than zero.
Common misconception
Pupils believe that subtraction is commutative and therefore equations can be written in any order.
Model with physical resources such as marbles in a bag that 4 - 6 results in a negative change but 6 - 4 results in a positive change.
Teacher tip
If the resources are available, allow pupils to spend time engaging with the 'Marbles in a Bag' game to get hands-on experience of physical change. Marbles can be substituted for other resources such as counters.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Which of the following words is the same as add? Select all that apply.
Q2.The temperature is 32℃. It decreases by 9℃. Tick the symbols that would be needed to write this as an equation.
Q3.The temperature is 12℃. It drops by 11℃. Which of the following unsolved equations matches the problem?
Q4.32 − 17 =
Q5.Which of the following mean 'subtract'?
Q6.Match the word with its correct definition.
one number, calculation or expression is equal to another
the result of subtracting one number from another
finding the total, or sum, by combining two or more numbers
make something different
Assessment exit quiz
6 Questions
Q1.Describe the change.
Q2.Which of the these would result in a negative change to the number of marbles in the bag?
Q3.Jun is adding in and taking out one pound coins from his piggy bank. Which of these would result in a negative difference to the amount of money in the piggy bank?
Q4.People are getting on and off a bus at different stops. The bus already has a number of passengers. Which of these would result in a negative change?
Q5.Jun and Sofia are playing the marbles game. They have used the equation 5 − 7 = −2. What does each of the numbers represent?
the number of marbles added to the bag
the number of marbles taken out of the bag
the change in the number of marbles
Q6.Jun adds £4 to his piggy bank and takes £6 out. Which of the following equations describes this?
To help you plan your 5 maths lesson on: Represent a change story using addition and subtraction symbols, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 5 maths lesson on: Represent a change story using addition and subtraction symbols, 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 2 maths lessons from the Negative numbers unit, dive into the full primary maths curriculum, or learn more about lesson planning.