Use knowledge of doubling, halving and the 2 times table to solve problems
Lesson details
Learning outcome
I can use knowledge of doubling, halving and the 2 times table to solve problems.
Key learning points
- Doubling is a multiplication where one of the factors is 2
- When one of the factors is 2, the other factor is half of the product.
- Doubles facts to 5 can help to double and halve 2-digit numbers.
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.
Check - To evaluate working, ensuring our response provides an answer to the given problem.
Common misconception
Children may revert to inefficient strategies to solve problems e.g. counting on, using fingers.
Within the second learning cycle, children are encouraged to evaluate strategies used by others. The most efficient strategies should be discussed together throughout the first learning cycle to support with this.
Teacher tip
For Task A, children can team up to create their own problems for their friends, or teachers can choose to create their own problems in advance. For Task B, group or paired work would be preferable. It is worth noting that it is only doubles of whole numbers that are even.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Match the statements to find half of each number.
6
10
7
20
Q2.What number goes in both sentences to make them correct?
Q3.Which of these problems could I use halving to find the missing factor?
Q4.What is the missing factor in this equation? 2 × = 16
Q5.Find the missing factor is this equation. × 2 = 26
Q6.There are 18 socks in a drawer. How many pairs of socks can be made? pairs
Assessment exit quiz
6 Questions
Q1.Match to complete each sentence.
24
60
18
30
Q2.There are 13 biscuits in a packet. How many biscuits will be in two packets? biscuits
Q3.Match the statements.
Half of 28 is equal to 14
Half of 14 is equal to 7
Half of 26 is equal to 13
Half of 80 is equal to 40
Q4.Find the missing factor in each equation.
9
20
11
13
Q5.Which of these numbers are examples of a double of a whole number?
Q6.If there are 28 pencils in two packets, how many pencils are in one packet? pencils.
To help you plan your 2 maths lesson on: Use knowledge of doubling, halving and the 2 times table to solve problems, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 2 maths lesson on: Use knowledge of doubling, halving and the 2 times table to solve problems, 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.