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.
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.
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.
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
no regrouping
regrouping in ones
regrouping in tens
