Explain that the addends can be added in any order
Lesson details
Learning outcome
I can explain that the addends can be added in any order.
Key learning points
- When we add three numbers, the sum will be the same whichever pair of addends we add first.
- The order of the addends can change and the sum will stay the same.
Keywords
Addends - Any numbers that are added together.
Efficient - Not wasting time or effort. An efficient strategy is one we can carry out easily.
Strategy - A plan or method to achieve a specific goal.
Common misconception
Children may not understand that either pair of addends can be added first and the sum will remain the same.
Use concrete materials to represent the addends for children to explore, discussing what is the same (the addends) and what is different (the pair being added first).
Teacher tip
This is the first time they will be exploring the associative law. Children do not need to know the term 'associative law', they just need to understand that they can add any pair of numbers first and that this will not change the sum.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Look at each expression and match it to the correct description.
Q2.Match the addition expressions that are equal to each other.
Q3.Which of the equations could not represent this ten frame?
Q4.Look at this ten frame. Altogether there are 9 counters. The addends are 2, 4 and
Q5.Match each number to the correct part of the model.
Q6.Which equation is shown on this number line?
Assessment exit quiz
6 Questions
Q1.We can add numbers in any order. We say that addition is __________
Q2.If you begin by adding the first two addends together, what would your calculation now be?
Q3.Match the steps the three different children took to find the number of pieces of fruit altogether.
Q4.Laura has been adding three addends by combining different pairs. Match each starting expression to her new equation.
Q5.Which equations represent the part-part-whole model?
Q6.Which expressions are equal?
To help you plan your 2 maths lesson on: Explain that the addends can be added in any order, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 2 maths lesson on: Explain that the addends can be added in any order, 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 Calculating within 20 unit, dive into the full primary maths curriculum, or learn more about lesson planning.