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Lesson 2 of 15
Explain how to use long multiplication to multiply two 2-digit numbers regrouping ones to tens
I can explain how to use long multiplication to multiply two 2-digit numbers regrouping ones to tens.
Lesson 2 of 15
New
New
Explain how to use long multiplication to multiply two 2-digit numbers regrouping ones to tens
I can explain how to use long multiplication to multiply two 2-digit numbers regrouping ones to tens.
Lesson details
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.
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.
Teacher tip
Equipment
Licence
This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
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Prior knowledge starter quiz
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6 Questions
Q1.Look at the grid model for 31 × 33 shown. 33 has been partitioned into…
Look at the grid model for 31 × 33 shown. 33 has been partitioned into…
32 and 9
30 and 30
3 and 3
Q2.Look at the part-part-whole model. The multiplication equation is:
Look at the part-part-whole model. The multiplication equation is:
35 × 7
35 × 72
35 × 207
Q3.Which of these part-part-whole models represents 552 × 17
Which of these part-part-whole models represents 552 × 17
Q4.Calculate 245 × 3 = using short multiplication.
Calculate 245 × 3 = using short multiplication.
Q5.Calculate 645 × 7 = using short multiplication.
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
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
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6 Questions
Q1.When using the long multiplication layout the __________ number usually goes at the top.
When using the long multiplication layout the __________ number usually goes at the top.
smaller
Q2.Look at the long multiplication layout below. What are the highlighted numbers in the box known as?
Look at the long multiplication layout below. What are the highlighted numbers in the box known as?
Quotients
Addends
Products
Q3.Look at the long multiplication. Complete it to calculate the product.
Look at the long multiplication. Complete it to calculate the product.
Q4.Match the expressions to the correct amount of regrouping.
Match the expressions to the correct amount of regrouping.
No regrouping
1 regroup from ones to tens
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? £
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? £
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? £