Explain how to use long multiplication to multiply two 2-digit numbers regrouping ones to tens
Lesson details
Learning outcome
I can explain how to use long multiplication to multiply two 2-digit numbers regrouping ones to tens.
Key learning points
- Partition one of the factors.
- Calculate the partial products.
- Add the partial products to recombine.
Keywords
Partial product - Any of the multiplication results we get leading up to an overall multiplication result is a partial product.
Common misconception
Pupils forget to include regrouped values when multiplying.
Decide on a place and structure for regrouped values - they are included at the top of the algorithm in these lessons to avoid confusion with addition regrouping when partial products are summed. Ensure this is clearly modelled.
Teacher tip
Continue to emphasise place value language when describing the long multiplication algorithm and have high expectations that pupils will do the same. This will promote understanding and provide a sense of magnitude when checking the product is sensible.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Look at the grid model for 31 × 33 shown. 33 has been partitioned into…
Q2.Look at the part-part-whole model. The multiplication equation is:
Q3.Which of these part-part-whole models represents 552 × 17
Q4.Calculate 245 × 3 = using short multiplication.
Q5.Calculate 645 × 7 = using short multiplication.
Q6.Class 6 at Oak Academy has 227 sheets of stickers. Each page has 5 stickers. How many stickers do they have altogether? stickers
Assessment exit quiz
6 Questions
Q1.When using the long multiplication layout the __________ number usually goes at the top.
Q2.Look at the long multiplication layout below. What are the highlighted numbers in the box known as?
Q3.Look at the long multiplication. Complete it to calculate the product.
Q4.Match the expressions to the correct amount of regrouping.
Q5.Use long multiplication to calculate. A football match is selling tickets at £24 It sells 24 tickets on Monday. How much money was made on Monday? £
Q6.Use long multiplication to calculate. A football match is selling tickets at £24 It sells 116 tickets on Monday. How much money was made altogether? £
To help you plan your 6 maths lesson on: Explain how to use long multiplication to multiply two 2-digit numbers regrouping ones to tens, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 6 maths lesson on: Explain how to use long multiplication to multiply two 2-digit numbers regrouping ones to tens, 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 Multiplying and dividing by 2-digit numbers unit, dive into the full primary maths curriculum, or learn more about lesson planning.