Halve even 2-digit numbers and multiples of 10
Lesson details
Learning outcome
I can halve even 2-digit numbers from 12 to 28 and unitise and apply known facts to halve even multiples of 10
Key learning points
- Halving facts to 10 can help to halve 2-digit numbers.
- To halve 2-digit numbers, partition the 2-digit number, halve the tens and the ones, then recombine.
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.
Partition - The act of splitting an object or value down into smaller parts.
Common misconception
Incorrectly partitioning and halving odd multiples of 10
Ensure children use representations where they are able to see the partitioning of the number into an even multiple of 10 and 10 more. That way, they can clearly see they are still finding half of 30 for example.
Teacher tip
Support children to apply known halving facts to halve even 2-digit numbers. Using unitising, children can halve multiples of 10 and ones digits to find one half of a range of 2-digit numbers where there is no regrouping.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Use the bar model to complete the sentence. Half of 6 is equal to
Q2.If I know that half of 8 is equal to 4, 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 10 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 7 biscuits. How many biscuits did Aisha have to begin with? biscuits
Assessment exit quiz
6 Questions
Q1.Match the statements.
Half of 6 is equal to 3
Half of 10 is equal to 5
Half of 12 is equal to 6
Half of 8 is equal to 4
Q2.Which facts will help you to find half of 14 by partitioning the parts?
Q3.Match the known facts.
Half of 40 is equal to 20
Half of 20 is equal to 10
Half of 60 is equal to 30
Half of 80 is equal to 40
Q4.How can you find half of 28?
Q5.Look at the image of Base 10 blocks. What is half of 24?
Q6.Find half of 50 by partitioning. Half of 50 =
To help you plan your 2 maths lesson on: Halve even 2-digit numbers and multiples of 10, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 2 maths lesson on: Halve even 2-digit numbers and multiples of 10, 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.