Explain how doubling and halving are related
Lesson details
Learning outcome
I can explain how doubling and halving are related.
Key learning points
- If double 4 is 8, then half of 8 is 4
- Halving means to partition the number into two equal groups.
- Halving is the inverse of doubling.
- Whether doubling or halving, we can also see these as our 2 times tables facts.
Keywords
Double / Doubling - To become twice as many / to multiply by two.
Half / Halving - One of two equal parts of a whole. To divide into two equal parts.
Common misconception
Children may inaccurately recall related doubling facts to solve halving problems.
Represent each problem as a bar model (as the whole and two equal parts) before solving. Encourage children to check that the two equal parts are equal to the whole.
Teacher tip
Use the stem sentence, 'If I know ..., then I know ...' to help children see how doubling facts can help solve halving problems. Ensure children are encouraged to use this stem sentence when talking through their approach to a problem.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Which double is being shown here?
Q2.Double 3 tens is ___
Q3.Double 12 is
Q4.Double 40 is
Q5.Which of these equations could I use doubling knowledge to solve?
Q6.What is 14 × 2 = ?
Assessment exit quiz
6 Questions
Q1.Use the bar model to complete the sentence. Half of 8 is equal to
Q2.If I know that half of 6 is equal to 3, then I know that _____________
Q3.Which facts are represented by this bar model?
Q4.Which equation is represented by this bar model?
Q5.Alex had 4 marbles. He gave half to Jacob. How many marbles did Jacob get? marbles
Q6.Aisha gave half of her biscuits to Alex. Aisha was left with 6 biscuits. How many biscuits did Aisha have to begin with? biscuits
To help you plan your 2 maths lesson on: Explain how doubling and halving are related, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 2 maths lesson on: Explain how doubling and halving are related, 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 Multiplying by 2, doubling and halving (factors and products) unit, dive into the full primary maths curriculum, or learn more about lesson planning.