Multiply a 2-digit number by a 1-digit number using partitioning and representations (one regroup)
I can use an array to represent multiplication and use place value in an array to represent multiplication of a 2-digit number
Multiply a 2-digit number by a 1-digit number using partitioning and representations (one regroup)
I can use an array to represent multiplication and use place value in an array to represent multiplication of a 2-digit number
Lesson details
Key learning points
- Partitioning allows us to multiply the tens and then the ones and recombine the products.
- The grid can represent the array.
- Multiply the ones and tens separately and recombine.
Keywords
Array - An array is the layout of items (such as objects, numbers, etc.) arranged in rows and/or columns.
Product - The result of two or more values multiplied together.
Regroup - The process of unitising and exchanging between place values is known as regrouping.
Common misconception
Pupils may not regroup correctly if they do not understand the place value of digits in a factor.
Encourage pupils to use the stem sentences / array to identify when they may need to regroup.
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
no regrouping
regrouping in ones
regrouping in tens
