Multiply a 2-digit number by a 1-digit number using expanded multiplication (regrouping 10s to 100s)
I can use expanded multiplication to record regrouping from the 10s to the 100s.
Multiply a 2-digit number by a 1-digit number using expanded multiplication (regrouping 10s to 100s)
I can use expanded multiplication to record regrouping from the 10s to the 100s.
Lesson details
Key learning points
- If the product of the single digit and the tens number is greater than 100 then you regroup ten tens into one hundred.
- If the product of the single digit and the tens number is greater than 100 the partial product will be a 3-digit number.
- There are similarities between the representations of multiplication.
Keywords
Expanded multiplication - Expanded multiplication is a way of recording the steps 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.
Common misconception
Pupils may not align or regroup correctly leading to an inaccurate calculation.
Model accurately what happens when we regroup from 10s to 100s. Why did this happen? How do we record this?
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).
Lesson video
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Starter quiz
6 Questions
Exit quiz
6 Questions
0 regroup
Regrouping in 1s to 10s
Regrouping in 10s to 100s
