Multiply a 3-digit by a 1-digit number with multiple regroups
I can multiply a 3-digit by a 1-digit number using expanded and short multiplication (multiple regroups).
Multiply a 3-digit by a 1-digit number with multiple regroups
I can multiply a 3-digit by a 1-digit number using expanded and short multiplication (multiple regroups).
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
Common misconception
Incorrectly regrouping or forgetting to record a regrouped amount.
Clear teacher modelling. 'What does this digit represent?' 'Where do we place the regrouped amount?'
Keywords
Short multiplication - A way of recording using columns to set out and calculate a multiplication.
Expanded multiplication - A way of recording the steps of a calculation focusing on partitioning one or more factors and showing partial products.
Regroup - The process of unitising and exchanging between place values is known as regrouping.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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Starter quiz
6 Questions
Exit quiz
6 Questions
9
28
49
72
27
600 + 9
600 + 30 + 18
1000 + 15
1000 + 50 + 30
