Multiply a 2-digit number by a 1-digit number using expanded multiplication (regrouping 1s to 10s)
I can use expanded multiplication to record regrouping from the 1s to the 10s
Multiply a 2-digit number by a 1-digit number using expanded multiplication (regrouping 1s to 10s)
I can use expanded multiplication to record regrouping from the 1s to the 10s
Lesson details
Key learning points
- If the product of the ones digits is greater than 10, you regroup ten ones into one ten.
- If the product of the ones digits is greater than ten, the partial product will be a 2-digit number.
- There are similarities between the representations of multiplication.
Keywords
Regrouping - The process of unitising and exchanging between place values is known as regrouping.
Expanded multiplication - Expanded multiplication is a way of recording a calculation focusing on partitioning one or more factors and showing partial products.
Common misconception
Pupils may not align or regroup correctly leading to an inaccurate calculation.
Continue to ask what each digit that has been recorded represents. Demonstrate the regrouping using base ten blocks to help.
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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