New
New
Year 5
Multiply a 3-digit by a 1-digit number with one or two regroups
I can multiply a 3-digit by a 1-digit number using expanded and short multiplication (one or two regroups).
New
New
Year 5
Multiply a 3-digit by a 1-digit number with one or two regroups
I can multiply a 3-digit by a 1-digit number using expanded and short multiplication (one or two regroups).
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Lesson details
Key learning points
- If the product of the ones digits is greater than 10 then you regroup ten ones into one ten.
- If the product of the 1-digit number and the tens digit is greater than 100 then you regroup ten 10s into one 100
- If the product of the 1-digit number and the 100s digit is greater than 1,000 then you regroup ten 100s into one 1,000
Keywords
Regroup - The process of unitising and exchanging between place values is known as regrouping.
Expanded multiplication - A way of recording the steps of a calculation focusing on partitioning one or more factors and showing partial products.
Short multiplication - A way of recording using columns to set out and calculate a multiplication.
Common misconception
Children may misalign digits when arranging into the short multiplication layout.
Children should use unitising language to help them understand and apply this to formal written methods.
Draw attention to regrouping. ‘If there are ten or more tens, we must regroup the tens into hundreds and tens.’
Teacher tip
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).Starter quiz
Download starter quiz
6 Questions
Q1.
What’s the next number in the sequence: 11, 22, 33, ___
34
54
64
Q2.
Look at the short multiplication. ___ tens have been regrouped.

Q3.
Look at the expanded multiplication. tens have been regrouped.

Q4.
Select the representation which shows: 42 × 3

Pic 1

Pic 2


Pic 4
Q5.
Use a formal or informal method to solve this word problem: If all these boxes are the same height, how tall is the stack of boxes?

Q6.
Find the missing number.

Exit quiz
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6 Questions
Q1.
Which multiple is the odd one out?
5
10
15
20
Q2.
Select the correct expanded arrangement for:



Pic 2

Pic 3
Q3.
Which multiplication will need regrouping in the ones column only?
323 × 3
323 × 2
303 × 3
Q4.
Use expanded multiplication to solve: 422 × 4. Write the product in numeral form.
Q5.
Use short multiplication to solve: 406 × 6. Write the product in numeral form.
Q6.
What could the missing number be?
