Multiply a 2-digit number by a 1-digit number using short multiplication (regrouping 1s to 10s)
Lesson details
Learning outcome
I can use short multiplication to record regrouping from the 1s to the 10s.
Key learning points
- If the product of the ones digit is greater than 10, you regroup ten ones into one ten.
- Record the additional ten or tens as a small digit to be added in with the tens.
- Short multiplication results in only one product being recorded.
- There are similarities and differences between the expanded recording and short multiplication.
Keywords
Short multiplication - A method using columns to set out and calculate a multiplication is short multiplication.
Regrouping - The process of unitising and exchanging between place values is known as regrouping.
Common misconception
Pupils may not align or regroup correctly leading to an inaccurate calculation.
Ask children about the additional ten or tens as a small digit to be added in with the tens. What does this show? What is the value?
Teacher tip
Ensure pupils can generalise short multiplication results in only one product being recorded. Allow lots of opportunities for pupils to practise the layout and set up of the strategy.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Jacob is chanting his 7 times tables: 7, 14, 21, 28, ___ What comes next?
Q2.Aisha is chanting her 9 times tables: 9, 18, 27, What comes next?
Q3.Look at the multiplication equation: 82 × 2. When multiplying in the ones column this will give us a ___ digit partial product.
Q4.Use short multiplication to calculate this question: 42 × 2 =
Q5.Calculate and sort the multiplication equations into descending order.
Q6.The product is 2 digits. 3 and 11 are two of my many factors. This number is also a multiple of 9. What number could it be?
Assessment exit quiz
6 Questions
Q1. The answer when two or more values are multiplied together is known as the __________.
Q2.Complete the sentence 3 × 6 ones is 18 ones. 18 is made up of 1 ten and 8 ones. I will regroup 1 ten and place it underneath the column.
Q3.I have regrouped tens.
Q4.The multiplication is: 27 × 2 Which short multiplication shows this correctly?
Q5.One ticket costs £18. How much would Lucas’s tickets costs altogether? Remember to use correct notation in your answer.
Q6.What is the missing factor?
To help you plan your 5 maths lesson on: Multiply a 2-digit number by a 1-digit number using short multiplication (regrouping 1s to 10s), download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 5 maths lesson on: Multiply a 2-digit number by a 1-digit number using short multiplication (regrouping 1s to 10s), 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 Multiplication by partitioning leading to short multiplication (2 by 1-digit) unit, dive into the full primary maths curriculum, or learn more about lesson planning.